Bài tập môn Tiếng Anh Lớp 12 - Luyện tập cách sử dụng câu bị động (Có đáp án)

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PASSIVE VOICE 
Exercise 1: Choose the best answer by circling the corresponding letter A, B, C, or D 
1/ The manager insisted .me a position in the company. 
A. for offering B. on offering C. in offer D. on offer 
2/ The flight attendant reminded the man that smokingthere. 
 A. was not allowed B. is not allowed C. not to allow D. not allow 
3/ The little boy begged the lady ..some soup. 
 A. give B. gives C. giving D. to give 
4/ They invited me ........... the weekend with them. 
 A. spends B. spend C. to spend D. spending 
5/ He reminded me .......... the letter. 
 A. post B. to post C. posting D. to posting 
6/ I warned Jim .............. playing with the snakes. 
 A. for B. in C. of D. against 
7/ Mary apologized for ................. him earlier. 
 A. not phoning B. not phone C. not to phone D. not to phoning 
8/ She advised him..................harder. 
 A. to study B. to studying C. study D. studying 
9/ My mother asked me ..............the window. 
 A. open B. opening C. to opening D. to open 
10/ Susan insisted on ............ Mary to the beach. 
 A. drive B. driving C. to drive D. to driving 
11/ Huong congratulated me on .............. the entrance exam. 
 A. to pass B. to passing C. passing D. passed 
12/ Mr Smith thanked Linda............. inviting him to the party. 
 A. for B. of C. on D. to 
13/ Mary refused ........... me any more money. 
 A. to lend B. to lending C. lend D. lending 
14/ The teacher told his studentsall the homework before they .to class. 
 A. do/ come B. to do/ come C. to do/ came D. do/ came 
15/ The supervisor apologized 
 A. for be late B. for being late C. on being late D. on be late. 
16/ The father told his son..his time games all day. 
A. not to waste/ play B. not to waste/playing C. not waste/play D.not waste/ playing 
17/ The lecturer told the students not to hesitate to ask if they .a question. 
 A. have B. has C. to have D. had 
18/ My mother advised me .hope. 
 A. not lose B. not to lose C. not losing D. not to losing 
19/ She said she would visit me . 
 A. following day B. the next day C. tomorrow D. next day 
20/ He said he.. a busy day. 
 A. had had B. have had C. did have D. has had. 
Exercise 2: Choose the correct answer to complete the sentences. 
1. America __________ By Columbus in 1492. 
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A. are discovered B. were discovering C. is discovered D. was discovere 
2. Parrots and crows __________ The most intelligent birds. 
A. were considering B. are considered C. Considered D. was considered 
3. I still can’t believe! My bicycle __________ last night. 
 A. was stolen B. was stealing C. were stolen D. stole 
4. Mary traffic accidents __________ by dangerous driving. 
 A. cause B. caused C. are caused D. which are caused. 
5. Many US automobiles __________ in Detroit, Michigan. 
A. manufacture B. are manufactured C. have manufactured D. are manufacturing 
6. Grass __________ by fat cows on the green meadow 
A. are eaten B. was being eaten C. were being eat D. was been eaten 
7. So much progress __________ That there may be space-frights to Mars 
A. is being made B. are being made C. will be made D. will being made 
8. Many people believe we can look forward to the day when even our household jobs like cleaning and 
decorating__________ by computer-control robots. 
A. will be doing B. are being done C. would be done D. will be done. 
9. English __________since 2002. 
A. have been learned B. has been learnt C. has to learn D. have to learn 
10. Your bill should __________ before you leave the hotel. 
A. be paid B. is paid C. are paid D. was paid 
Exercise 3: Choose the underlined word or phrase or phrase in each sentence that need correcting. 
1. The new school will be open soon by the local government 
 A B C D 
2. This machine have to be repaired 
 A B C D 
3. Several people have been bitten on the dog 
 A B C D 
 4. A new hospital is being build in town 
 A B C D 
 5. The man were being questioned by the police then. 
 A B C D 
PASSIVE VOICE 
Exercise 1: Change these sentences into Passive voice 
1 Tom delivers the mail every day . 
2. Mr. John manages the export division 
3The teacher corrects our exercises.. 
4.Somebody calls the president every day  
5.Where do people speak English ? . 
6. Weeds cover the riverbank......................................................................................... 
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7. They use milk for making butter and cheese...................................................................... 
8. People speak English in almost every corner of the world .......................................................... 
9. People spend a lot of money on advertising everyday ................................................................ 
10. No one believes his story........................................................................................... 
11 Fire destroyed that house ................................................................................ 
12.The students attended the lecture .............................................................................. 
13.The movie disappointed us very much ............................................................................... 
14.The police easily captured the thief ............................................................................... 
15.John returned the money last night ......................................................................... 
16. Smoke filled the room......................................................................... 
17. Bob took that book from the desk......................................................................... 
18.They started a dancing class last week......................................................................... 
19. Mr. Smith saw the accident......................................................................... 
20. The teacher returned our written work to us......................................................................... 
21.For the time being, Alice is teaching that group ....................................................................... 
22.John is calling the other members ............................................................................................ 
23.The company is developing a new procedure .......................................................................... 
24.Who are they keeping in the kitchen? 
25.What books are people reading this year ? 
26. Nam is milking the cows.  
27. My father is washing the car.  
28. Sheila is drinking a cup of tea.  
29. Mary is cutting the cake with sharp knife................. 
30. The mailman is delivering the mail now 
31.Martha was delivering the documents to the department .......................................................... 
32.A french architect was designing the palace 
33.Mr Brown was writing the report at 8 p.m yesterday 
34. Who was painting those windows.? 
35. The chef engineer was instructing all the workers of the plant 
36. They were not eating dinner.  
37. We were painting the gate.  
 38. You were not driving him home.  
39. He was feeding the dogs.  
40. Was she reading these lines?. 
41. Beth has finished the report ................................................................................ 
42. Somebody has taken my briefcase .............................................................................. 
43. She has finished the report at noon .............................................................................. 
44. The police have arrested five suspects .............................................................................. 
45. Kerrie has paid the bill. .............................................................................. 
46. I have eaten a hamburger. .............................................................................. 
47. I have opened the present............................................................................... 
48. They have not read the book. .............................................................................. 
49. You have not sent the parcel. ............................................................................. 
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50. Has she phoned ............................................................................................... 
51.The delegates had received the information before the recess ......................................................... 
52. He had finished his home work before she came............................................................................ .. 
53. They had written the passage............................................................................... 
54. They had planted trees.............................................................................. 
55. I know that they had told him of the meeting.............................................................................. 
56. They had started a fight. .............................................................................. 
57. I had not closed the window. .............................................................................. 
58. They had not bought the paper. .............................................................................. 
59. Had she solved the problem? –.............................................................................. 
60. John will receive the papers tomorrow................................................................ 
61. Somebody will call Mr. Watson tonight ................................................................................. 
62. Barbara will eat the cake ................................................................................ 
63. They will build a new bridge near my house next year................................................................................. 
64. They will widen the road to our village................................................................................. 
65. They will hold the meeting before May Day................................................................................ 
66. Jane will buy a new computer. ................................................................................ 
67. Millions of people will visit the museum. ................................................................................ 
68. Our boss will sign the contract. ................................................................................ 
69.They will not ask him. ................................................................................ 
70. John is going to call the other members .................................................................................. 
71. The company is going to develop a new procedure ................................................................. 
72. The students are going to plant trees here....................................................................................... 
73. My mother is going to sell this house................................................................................... 
74. They are going to decorate the room next week................................................................ 
75. She is going to tell a story ....................................................................................................... 
76. The teacher is going to give a lesson ....................................................................................... 
77. They are going to buy a new car next month. .......................................................................... 
78.How can they open this safe? 
79.You ought to water these plants once a week. 
80.They may discuss the problems again 
81.You should place matches out of reach of children. 
82.They can gain nothing without effort. 
83.People must conserve natural resources 
84. they said that I am a teacher...................................................................................... 
85. people said that Nam killed his wife........................................................................ 
86. Does he often help you?............................................................................................. 
87. What is she doing?...................................................................................................... 
88. She bought a new car yesterday................................................................................... 
89. People thought that she is a robber........................................................................... 
90. my father often buys me perents on my birthday....................................................... 
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Exercise 2: Choose the underlined word or phrase in each sentence that need correcting. 
1. The new school will be open soon by the local government 
 A B C D 
2. This machine have to be repaired 
 A B C D 
3. Several people have been bitten on the dog 
 A B C D 
4. A new hospital is being build in town 
 A B C D 
5. The man were being questioned by the police then. 
 A B C D 
Exercise 3: Choose the sentence which is closest in meaning to the original one. 
6. They cancelled all flights because of fog. 
 A. All flights were because of fog were cancelled C. All flight were because of fog cancelled. 
 B. All flight were cancelled because of fog. D. All flights were cancelled by them of fog. 
7. They had to postpone the meeting because of illness. 
A. The meeting because of illness had to be postponed. B. The meeting had to because of illness be postponed. 
C. The meeting had to postponed because of illness. D.The meeting had to be postponed because of illness 
8. They are building a new highway around the city. 
 A.A new highway around the city is being built. C.A new highway is being built around the city. 
 B.A new highway is being built around the city by them. D. Around the city a new highway is being built. 
9. They will ask you a lot of questions at the interview. 
 A. You will be asked a lot of questions at the interview 
 B. You will be asked a lot of questions at the interview by them. 
 C. A lot of questions will be asked you at the interview. 
 D. A lot of questions will be asked at the interview. 
10. They have built a new hospital near the airport. 
 A.A new hospital near the airport has been built. C.A new hospital has been built near the airport. 
 B.A new hospital has been built near the airport by them. D. Near the airport a new hospital has been 
11. My father gives me a new shirt. 
 A. A new shirt is given me by my father B. A new shirt is give me by my father. 
 C. A new shirt is given by me my father. D. A new shirt are given me by my father 
12. A new hat is bought by Lan. 
 A. Lan buys a new hat. B. Lan buy a hat new. 
 C. Lan bought a new hat. D. Lan is bought a new hat. 
13. People speak English everywhere. 
 A. English was spoken everywhere. B. English was speak 
 C. English is spoken everywhere. D. English is speaks everywhere. 
14. They drink much wine. 
 A. Much wine are drunk by them. B. Much wine is drank by them. 
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 C. Much wine is drunk by them. D. Much wine is drink by them. 
15. They belived that he saved me 
 A. It was belived that he saved me C. He was belived to have saved me 
 B. It was belived that he has saved me. D. A and C are correct. 
I. Đổi sang câu bị động 
 1. He always plays game after school. 
 2. My student visited her granny last week. 
 3. I seldom do the homework. 
 4. Do you enjoy this cake? 
 5. Did you change the rule? 
 6. Who bought this umbrella? 
 7. Which magazines do you prefer? 
 8. When did you enjoy this delicious cake? 
 9. Why didn’t you clean the house? 
 10. My sister gave you this pizza. 
II. Đổi sang câu bị động. 
 1. My wife cleaned the floor and washed the dishes yesterday. 
 2. He opens the door and closes the door every day. 
 3. I got my husband to repair my bicycle. 
 4. I let my children go out. 
 5. Don’t open your book. 
 6. Will you finish her exam? 
 7. I made her finish her exam. 
 8. Did you change your password? 
 9. Have you finished the report? 
 10. Why did my student visit her granny last week? 
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III. Đổi sang câu chủ động 
 1. This pencil is used to draw by Nina. 
 2. This book was bought at this shop by my sister yesterday. 
 3. My house had been painted before I travelled. 
 4. By whom was this house painted? 
 5. Will the ruler be bought by my mother tomorrow? 
 6. This pizza was given to you by my sister. 
 7. You were given this pizza by my sister. 
 8. I was let to go out. 
 9. The pictures have been finished by Nina. 
 10. Were these houses sold by my father? 
IV. Đổi sang câu chủ động 
 1. My students were let to play game in the class. 
 2. The test was done by my students. 
 3. Where were baskets bought? 
 4. Can this radio be bought by her mother? 
 5. This cake was made to give my sister. 
 6. I had my pencil repaired yesterday. 
 7. It is difficult for information technology to be learned. 
 8. My room needs painting. 
 9. My room needs to be painted. 
 10. People say that he is good at English. 
THE KEY 
1. The mail is delivered every day by Tom. 
2. The export division is managed by Mr. John. 
3. Our exercises are corrected by the teacher. 
4. The president is called every day by somebody 
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5. Where is English spoken ? 
6. The riverbank is covered by weeds 
7. Milk is used for making butter and cheese.. 
8. English is spoken in almost every corner of the world by the people 
9. a lot of money are spent on advertising everyday by the people 
10. His story is believed by anyone 
II. 
11.That house was destroyed by fire 
12.The lecture was attended by the students 
13.We were disappointed by the movie very much. 
14.The thief was captured by the police easily. 
15.The money was returned by John last night 
16. The room was filled with smoke. 
17. That book was taken from the desk by Bob. 
18. a dancing class was started last week by them. 
19. the accident was seen by Mr.Smith 
20. our written work was returned to us by the teacher 
III. 
21.For the time being, that group is being taught by Alice. 
22.The other members is being called by John. 
23.A new procedure is being developed by the company. 
24.Who is being kept in the kitchen. 
25.What books are people being read this year. 
26. The cows are being milked by Nam 
27. The car is being washed by my father 
28. A cup of tea is being drunk by Sheila 
29. The cake is being cut with sharp knife by Mary 
30. The mail is being devivered by the mailman 
IV. 
31.The documents were being delivered to the department by Martha. 
32.The palace was being designed by a french architect. 
33.The report was being written at 8 p.m yesterday by Mr Brown. 
34.Who were those windows being painted? 
35. All the workers of the plant were being instructed by the chef engineer 
36. Dinner was not being eaten by them 
37. The gate was being painted by us 
38. He was not being driven home by me 
39. The dogs were being fed by him 
40. Were these lines being read by her? 
V. 
41.The report has been finished by Beth. 
42.My briefcase has been taken. 
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43.The report has been finished at noon. 
44.Five suspects have been arrested by the police. 
45. The bill has been paid by Kerrie 
46. A hamburger has been eaten by me 
47. The present has been opened by me 
48. The book has not been read by them 
49. The parcel has not been sent by me 
50. Has he been phoned by her? 
VI. 
51.The information had been received before the recess by the delegates. 
52. His home work had been finished before she came. 
53. The passage had been written. 
54.Trees had been planted. 
55. I know that he had been told of the meeting by them 
56. A fight had been started by them 
57. The window had not been closed. 
58. The paper had not been bought by them. 
59. Had the problem been solved by her? 
VII. 
60.The papers will be received tomorrow by John. 
61.Mr Watson will be called tonight. 
62.The cake will be eaten by Barbara. 
63.A new bridge will be built near my house next year. 
64.The road will be widened to our village. 
65. The meeting will be held before May day by them 
66. A new computer will be bought by Jane 
67. The museum will be visited by million people 
68. The contact will be signed by our boss 
69 .He will not be asked by then 
VIII. 
70.The other members are going to be called by John. 
71.A new procedure is going to be developed by the company. 
72.Trees are going to be planted here. 
73.This house is going to be sold by my mother. 
74.The room is going to be decorated next week (by them) 
75. A story is going to be told by her 
76. A lesson is going to be given by the teacher 
77. A new car is going to be bought by them next month. 
78.How can this safe be opened? 
79.These plants ought to be watered once a week. 
80.The problems may be discussed again. 
81.Matches should be placed out of reach of children. 
82.Nothing can be gained without effort. 
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83.Natural resources must be conserved. 
84.to be met 
85.to be appointed 
86.to be called 
87.to be surprised 
88.to be taken 
89.being excited 
90.being concerned 
91.B 92.A 93.A 94.B 95.B 
Lưu ý: Ví trị của trạng từ và cụm trạng từ: 
- Thời gian: sau BY. Ví dụ: These pens have been bought by Nina for 2 hours. 
- Ví trí: trước BY. Ví dụ: These pens have been bought at that shop by Nina. 
Chúng ta cùng làm bài tập để hiểu thêm bài học ngày hôm nay. 
I. Chuyển sang câu bị động. 
 1. Tom has seen this film before. 
 2. Nina has read the newspaper already. 
 3. They have seen these movies yet. 
 4. I have signed the contract. 
 5. These men have bought the tickets. 
 6. I have bought this teddy bear in that shop. 
 7. Vicky has found her hat. 
 8. I have lost my bag. 
 9. We have finished the report. 
 10. I have done my exercise for three days. 
II. Đổi sang câu chủ động. 
 1. These newspapers have been bought by Nina. 
 2. These reports have been typed for 2 hours. 
 3. My dogs have been taken good care of by my father. 
 4. Computer science has been studied by my brother since June. 
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 5. This movie hasn’t been seen by my mother. 
 6. This car has been bought by Nina. 
 7. The thief has been found by the police. 
 8. Her pens have been found. 
 9. The reports have been finished. 
 10. These pencil cases have been bought by Nina. 
I. Câu bị động ở dạng Yes-No Question. 
 Yes-No Question là những câu hỏi mà câu trả lời phải là yes hay no và thường được bắt đầu bằng: 
 1. Các động từ khiếm khuyết: shall, ought to, must, will, would, might, may 
 2. Các trợ động từ: Do, Does, Did, Have, Be. 
 Nào, chúng ta cùng đi vào những ví dụ về cách chuyển đổi câu chủ động sang câu bị động ở dạng này nhé. 
 Ví dụ 1: Does your friend eat that chocolate cake? (câu chủ động) 
 Bước 1: Xác định thì của câu hỏi. Vì đây là thì hiện tại đơn nên ta dùng công thức bị động. 
 → S + am/is/are+ V3/Ved. 
 Bước 2: Chúng ta cứ làm như một câu bị động ở thì hiện tại đơn bình thường, đừng quan tâm tới dấu chấm hỏi: 
 → That chocolate cake is eaten by your friend. 
 Bước 3: lúc này, ta mới trả dấu chấm hỏi về, và chỉ việc đưa am/is/are lên đầu câu là xong. 
 → Is that cake eaten by your friend? 
 Ví dụ 2: Did your mother tell this story? 
 Bước 1: Vì đây là thì quá khứ đơn nên ta dùng công thức bị động như sau: S + was/were + V3/ved. 
 Bước 2: Chúng ta che từ “Did” đi và làm như một câu bị động ở thì quá khứ đơn, ta có: This story was told by 
your mother. 
 Bước 3: ta trả lại dấu chấm hỏi bằng cách đưa was hoặc were lên đầu câu, ta có: → Was this story told by your 
mother? 
II. Dạng câu bị động Wh- Question. 
 1. Dạng 1: When/why/how/where + Yes –No Question. 
 1.1. Where does your friend eat that chocolate cake? 
 Ta sẽ làm 3 bước tương tự như dạng Yes-No Question rồi cuối cùng thêm các từ When, why, how, where là 
xong. 
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 → Where was that chocolate cake eaten by your friend? 
 2. Dạng 2: Câu bị động với Who + V + O 
 Các bạn nhìn vào ví dụ sau để biết cách chuyển đổi. 
 Ví dụ: Who made this cake? 
 → Whom was this cake made by? = By whom was this cake made? 
 3. Dạng 3: câu bị động với What và Which. 
 Ví dụ: Which books does your sister read? 
 → Which books are read by your sister? 
 Lưu ý: Vì does ở thì hiện tại đơn nên ta chia theo công thức bị động ở thì hiện tại đơn và are được chia phụ thuộc 
vào từ books. 
 Ví dụ: What plays did Nam Cam write? 
 → What plays were written by Nam Cao? 
 Lưu ý: Vì did ở thì quá khứ đơn nên ta chia theo công thức bị động ở thì quá khứ đơn và were được chia phụ 
thuộc vào từ plays. 
Bài tập 
Đổi sang câu bị động các câu sau: 
1. Does your brother find the key? 
2. Do you sweep the floor? 
3. Can your father finish the report? 
4. Which horses do you prefer? 
5. What song do the clowns sing? 
6. Who cleaned my room yesterday? 
7. Do you steal my pencil case? 
8. Which animals do you like? 
9. Who broke my glasses? 
10. Did he explain that lesson? 
11. Where this you buy this book? 
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12. Why does your father find you? 
13. When do you paint your house? 
14. Do you paint your house? 
15. Didn’t she find a job? 
16. Will your granny visit you? 
17. Do they wash the dishes? 
18. Where do they wash the dishes? 
19. When do they wash the dishes? 
20. Why will your granny visit you next week? 
1. Câu bị động đặc biệt dạng 1: 
 Cấu trúc: S + V1, V2 + O (Câu này có 2 động từ) 
 Ví dụ: 
 - I typed the letters and mailed them this morning. (câu chủ động) 
 - Với câu này, 2 động từ là typed và mailed, và có cùng một túc từ là letters. Vì vậy ta có cách đổi câu bị động 
như sau: 
 - Kết quả: The letters were typed and mailed this morning. (câu bị động) 
2. Câu bị động đặc biệt dạng 2: 
 Cấu trúc: S + V1, V2 + O1, O2 (câu này có 2 động từ, 2 túc từ) 
 Ví dụ: 
 - I have done my homework and have typed the report. (câu chủ động) 
 - Trong câu này, 2 động từ là done và typed, 2 túc từ là my homework và the report. Với câu dạng 2 động từ và 
2 túc từ, ta có cách đổi như sau: 
 - My homework has been done and the report has been typed. (câu bị động) 
3. Câu bị động đặc biệt dạng 3: 
 Cấu trúc: V + O + V Dùng cho MAKE hoặc LET 
 Ví dụ: 
 - He made us do this. (câu chủ động) = We were made to do this. (câu bị động) 
They let him go (câu chủ động) = He was allowed to go = He was let to go. 
 - Lưu ý: Khi đổi sang câu bị động, từ “LET” nên được đổi thành “ALLOW”. 
4. Bài tập: 
1. I type the reports and send them every day. 
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 A. The reports are typed and sent every day 
 B. The reports is typed and sent every day. 
 C. The reports are typed and send every day. 
2. They let me do. 
 A. I were allowed do 
 B. I was allowed to do 
 C. I was allowed do 
3. My sister has just swept the floor and has washed the dishes. 
 A. The floor has just been swept and the dishes have just been washed. 
 B. The floor and the dishes have just been swept and have just been washed. 
 C. A & B 
4. I bought an English book and gave it to my friend. 
 A. An English book was bought and given to my friend. 
 B. An English book was bought and was given to my friend. 
 C. An English book was bought. 
5. I made him do his homework. 
 A. He is made do his homework. 
 B. He was made to do his homework. 
 C. He was made do his homework. 
6. I let my girlfriend choose her own ring. 
 A. She chooses her own ring. 
 B. My girlfriend was allowed to choose her own ring. 
 C. My girlfriend was let choose her own ring. 
7. I made him come. 
 A. He was made to come. 
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 B. He is made to come. 
 C. He made to come 
8. My brother reads books and watches films every night. 
 A. Books are read and films are watched by my brother every night. 
 B. Books are read and films are watched every night by my brother. 
 C. A & B 
9. The students bought beautiful flowers and gave them to me. 
 A. Beautiful flowers were bought and given to me by the students. 
 B. Beautiful flowers was bought and given to me by the students. 
 C. Beautiful flowers are bought and given to me by the students. 
10. I let her go. 
 A. She was let go. 
 B. She was let to go. 
 C. She is let to go. 
1. Dạng 1: S + V + O + V 
 Và đây là ví dụ cho công thức trên: 
 I saw some people enter the block. 
 Với những câu ở dạng này, ta có cách đổi sang câu bị động như sau: 
 Some people were seen to enter the block. 
2. Dạng 2: Khi một mệnh đề chứa that (có nghĩa là rằng) được dùng như là túc từ cho một trong số những động từ 
sau:acknowledge (công nhận), assume (cho rằng), believe (tin), claim (yêu sách), consider (cân 
nhắc), estimate (ước tính), feel (cảm thấy), find (tìm thấy), report (báo 
cáo), say (nói), think (nghĩ), understand (hiểu). 
 Ví dụ: People say that he is jealous of her. (câu chủ động) 
 Ta có 2 cách đổi sang câu bị động. 
 Cách 1: It is said that he is jealous of her. (Với vế câu “It is said” được chia theo từ “say”. Vì “say” ở thì hiện 
tại nên ta có “It is said”. Sau đó viết tất cả những gì sau “that” ra. 
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 Cách 2: He is said to be jealous of her. (ta đưa chủ từ sau “that” lên và đó là từ “he”, “is said” được chia theo 
từ “say” ở câu chủ động. Còn động từ thứ 2 sẽ được chuyển thành to v. 
CHÚ Ý: Nhìn vào 2 ví dụ sau: 
I believed that he was innocent. I believe that he was innocent. 
Cách 1: It was believed that he was innocent. Cách 1: It is believed that he was innocent. 
Cách 2: He was believed to be innocent. Cách 2: He is believed to have been innocent. 
Nhìn vào 2 ví dụ trên, ta rút ra được như sau. 
 Ở ví dụ 1, ta thấy 2 động từ đều ở thì quá khứ hết believed và was hoặc đều hiện tại hết như believe và is thì ở cách 
2 ta phải chia là TO BE. 
 Ở