Unless (If not) là gì? | Cấu trúc, cách sử dụng - Vị trí của mệnh đề Unless - Bài tập vận dụng

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Unless (If not) là gì? | Cấu trúc, cách sử dụng - Vị trí của mệnh đề Unless - Bài tập vận dụng

Unless là gì?

Unless được sử dụng với ý nghĩa phủ định có nghĩa là trừ khi. Unless đồng nghĩa với If…not. Như If, Unless theo sau bởi một thì hiện tại, một quá khứ hoặc một quá khứ hoàn thành. Ví dụ:

  • You can’t get a job unless you have experience (Bạn không thể kiếm được việc trừ khi bạn có kinh nghiệm)
  • Unless you call me to say you are not coming, I will see you at the cantin (Trừ khi bạn gọi tôi nói rằng bạn không đến, thì tôi gặp bạn ở căng-tin)

Vị trí của mệnh đề Unless

Trong câu điều kiện ta không cần quan tâm đến mệnh đề trong câu. Mệnh đề chứa Unless có thể đứng trước hoặc sau mệnh đề chính. Ví dụ:

  • Unless I pass the driving test, i can not have driving license (Nếu tôi không qua bài thi lái xe tôi không thể có giấy phép lái xe)

Cách sử dụng cấu trúc Unless

1. Cấu trúc Unless trong câu điều kiện

Câu điều kiện là loại phổ biến nhất ta có thể sử dụng Unless.

Có 3 loại câu điều kiện như sau:

Cấu trúc Unless trongcâu điều kiện loại 1: Cấu trúc Unless trong câu điều kiện loại 1 dùng để diễn tả sự việc có thể xảy ra trong tương lai. Unless và If not có thể thay thế được cho nhau. Cấu trúc:

Unless + S + V (thì hiện tại đơn), S + Will/Can/Shall + V

Ví dụ:

  • We will fail the IELTS test unless you study hard (Chúng ta sẽ không vượt qua được bài thi IELTS trừ khi chúng ta học tập chăm chỉ.)
  • We will fail the IELTS test if we do not study hard (Chúng ta sẽ trượt bài kiểm tra IELTS nếu chúng ta không học tập chăm chỉ.)

Cấu trúc Unless trong câu điều kiện loại 2: Cấu trúc Unless trong câu điều kiện loại 2 dùng để diễn tả một tình huống không thể xảy ra trong hiện tại. If not và Unless có thể thay thế được cho nhau. Cấu trúc:

Unless + S + Ved/V2 (Quá khứ đơn), S + would + V

Ví dụ:

  • I would not be late for the bus unless I forgot his luggage (Tôi sẽ không bị trễ xe bus nếu tôi không để quên hành lý.)
  • I would not be late for the bus if I didn’t forget his luggage (Tôi sẽ không bị trễ xe bus nếu tôi  không để quên hành lý.)

Cấu trúc Unless trong câu điều kiện loại 3: Cấu trúc Unless trong câu điều kiện loại 3 để diễn tả một tình huống đã không xảy ra trong quá khứ. Có thể sử dụng If not thay thế cho Unless và ngược lại. Cấu trúc:

Unless + S + had + Ved/V3, S + would + have + Ved/V3

Ví dụ:

  • Unless Nam had walked in the rain yesterday afternoon, she would not have been sick.
  • If Nam had not walk in the rain yesterday afternoon, she would not have been sick (Nếu Lan không đi bộ dưới cơn mưa vào chiều hôm qua, cô ấy đã không bị ốm.)

2. Cấu trúc Unless dùng để đề xuất ý kiến

Bạn có thể sử dụng cấu trúc Unless để đề xuất ý kiến, trong trường hợp này cần lưu ý là không được sử dụng If..not để thay thế Unless. Ví dụ:

  • I’ll hang out with my friends – unless I’m tired (Tôi sẽ đi chơi với bạn của tôi trừ khi tôi mệt.)
  • I will hang out with Nam – unless he invites me (Tôi sẽ đi chơi với Nam trừ khi anh ấy mời tôi.)

3. Cấu trúc Unless mang tính cảnh báo

Bạn có thể sử dụng cấu trúc Unless để nhấn mạnh hoặc thúc giục một hành động cần được thực hiện khẩn cấp, tránh hậu quả. Bạn có thể sử dụng If..not tuy nhiên sắc thái lại không bằng được Unless. Ví dụ:

  • Unless Lan hurry up, he will be late the bus (Nếu Lan không khẩn trương lên thì anh ấy sẽ bị trễ xe bus).
  • Unless Nam studies, she will fail the examination (Nếu Nam không chịu học tập chăm chỉ, cô ấy sẽ bị trượt kì thi).

4. Lưu ý khi sử dụng cấu trúc Unless

Sau đây là những lưu ý quan trọng giúp bạn sử dụng chính xác cấu trúc Unless:

  • Unless đã mang sẵn ý nghĩa phủ định, vì thể Unless chỉ nên đi với câu khẳng định
  • Unless = otherwise = If not
  • Unless không bằng If not (lưu ý là if not viết liền). If not là câu điều kiện dạng ẩn ý. Người ta sử dụng câu điều kiện này khi đằng trước nó đã là một câu phủ định và dùng If not để tránh nhắc lại lần thứ 2 của vế phủ định này. Ví dụ: John won’t come tomorrow, if not, everything will become very difficult

Hướng dẫn viết lại câu với cấu trúc Unless

Dạng bài viết lại câu với Unless thường xuất hiện khá nhiều và đa dạng. Câu cho trước cho thể là câu cho sẵn if, cũng có thể là câu đảo ngữ hoặc là sử dụng các liên từ khác tương đương if hoặc là các câu điều kiện ẩn ý. 

Một mẹo hay để chinh phục dạng bài này là ta nên biến đổi câu theo 2 bước như sau:

  • Bước 1: Biến đổi câu về dạng truyền thống (đi với If)
  • Bước 2: Chuyển về Unless

Ví dụ: Study harder. Otherwise, you will fall the exam. (Học chăm chỉ hơn. Nếu không bạn sẽ trượt kỳ thi)

  • Bước 1: Ta có thể chuyển về dạng truyền thống như sau: If you don’t study harder, you will fall the exam.
  • Bước 2: Sau đó là chuyển về dạng chứa cấu trúc Unless: Unless you hurry up, you will be late.

Khi đã quen thuộc thì bạn có thể chuyển trực tiếp về Unless luôn. Một lưu ý nhỏ nữa là bạn hay hiểu rõ nghĩa của câu gốc. Sau đó khi viết lại câu, bạn check lại nghĩa của câu xem có giống với câu gốc không để đảm bảo không bị nhầm lẫn với những cấu trúc phức tạp.

Các lỗi thường gặp khi sử dụng cấu trúc Unless

Sau đây là một số lỗi các bạn thường gặp khi dùng Unless, hãy đọc thật kỹ để tránh những lỗi này nhé.

1. Sử dụng cấu trúc Unless trong dạng câu hỏi

Trong câu hỏi, bạn chỉ có thể sử dụng If not mà không thể dùng Unless để thay thế. Ví dụ: 

  • What will happen if I do not do my homework tomorrow? ( Điều gì sẽ xảy ra nếu ngày mai tôi không làm bài tập?)

Không được dùng: What will happen unless I do my homework tomorrow?

2. Sử dụng will/would trong mệnh đề có Unless

Trong mệnh đề có Unless thì chúng ta không được sử dụng will hoặc would Ví dụ: 

  • Unless you go to sleep soon, you will be exhausted (Nếu bạn không ngủ sớm, bạn sẽ kiệt sức)

Không được dùng: Unless you will go to sleep soon, you will be exhausted

3. Sử dụng khi diễn đạt ngữ nghĩa của If

Ta không thể sử dụng Unless để thay thế khi ta muốn trình bày câu mang ý nghĩa If. Ví dụ:

  • I will help her if my sister can’t make it (Tôi sẽ giúp cô ấy nếu em gái tôi không thể làm nó).

Không sử dụng: I will help her unless my sister can’t make it 🠚 Không được sử dụng

Bài tập cấu trúc Unless có đáp án chi tiết

Bài 1: Chọn đáp án chính xác nhất

Câu 1: Let’s go for a walk  – ______ you look too tired.

A. unless

B. if

Câu 2: He will take the job ________ the pay is too low.

A. unless

B. if

Câu 3: Lan will be back tomorrow _______ there is a plane strike.

A. unless

B. if

Câu 4: We will be surprised_______ he doesn’t have an accident soon.

A. unless

B. if

Câu 5: I think he would look prettier ______ he didn’t wear so much make-up.

A. unless

B. if

Câu 6: I am going to school this afternoon, ______ it rains.

A. unless

B. if

Câu 7: ________ you don’t stop drink milk tea, you will gain weight fast

A. unless

B. if

Câu 8: _______ he starts now, he will not reach there in time.

A. unless

B. if

Câu 9: ______ she was rich, she would spend all my time traveling.

A. unless

B. if

Câu 10: ______ we have enough time tomorrow, we will come and see you.

A. unless

B. if

Đáp án:

1. B

2. A

3. B 

4. B

5. A

6. A

7. A

8. B

9. A

10. A

Bài 2: Viết lại câu sao cho nghĩa không đổi:

  1. If you don’t study harder, you‘ll fail the test

=> Unless ………………………………………………………………..

  1. If she doesn’t practice writing every day, she can’t improve her writing skills.

=> Unless ………………………………………………………………..

  1. Unless this man is a professional driver, he can’t help you move by car.

=> If ………………………………………………………………..

  1. Unless you stop smoking, you might fall ill.

=> If ………………………………………………………………..

  1. If Lan doesn’t return this book to the library today, she will have to pay a fine.

=> Unless ………………………………………………………………..

  1. Unless she cleaned up the car now, her boss could ask her to do this.

=> If …………………………………………………………………

  1. Unless we were absent now, we would meet the headmaster.

=> If …………………………………………………………………

  1. If you didn’t know the number, you would not ring her up.

=> Unless …………………………………………………………………

  1. If Nam’s sister didn’t have a terrible headache she wouldn’t be absent from her class.

=> Unless …………………………………………………………………

  1. If Hung didn’t study hard, he could not get good marks.

=> Unless ………………………………………………………………..

Đáp án:

1. Unless you study harder, you‘ll fail the test

2. Unless she practices writing every day, she can’t improve her writing skill.

3. If this man is not a professional driver, he can’t help you move by car.

4. If you don’t stop smoking, you might fall ill.

5. Unless Lan returns this book to the library, she’ll have to pay a fine.

6. If she didn’t clean up the car now, her boss could ask her to do this.

7. If we were not absent now, we would meet the headmaster.

8. Unless you knew the number, you would not ring her up.

9. Unless Nam’s sister had a terrible headache she wouldn’t be absent from her class.

10. Unless Hung studied hard, he could not get good marks.

Bài 3. Điền If hoặc Unless vào mỗi câu câu sau cho đúng.

 1. ____you help me, I’ll be unable to do it.

 2. ____I meet him, I’ll tell him the whole truth.

3. You won’t get well ____you stop smoking.

4. ____you exercise regularly, you won’t be able to lose some weight.

5. ____you exercise regularly, you’ll lose some weight.

6. The teacher will be furious ____you don’t the homework.

7. You can’t go on vacation ____you don’t save some money.

8. You will feel cold ____you wear a warm jacket.

9. We’ll arrive on time ____we hurry.

10. Don’t call me ____it’s an emergency.

Đáp án

1. Unless

2. If

3. Unless

4. Unless

5. If

6. If

7. If

8. Unless

9. If

10. Unless

Bài 4: Viết lại các câu sao với nghĩa không đổi (dạng bài tập cấu trúc If chuyển sang Unless):

1. If you don’t call him today, you will miss the opportunity.

→ Unless

2. If they don’t check the system, it might fail.

→ Unless

3. If we do not leave now, we will be late.

→ Unless

4. If she doesn’t apologize, I won’t forgive her.

→ Unless

5. If you do not pay your bills on time, you will be charged a late fee.

→ Unless

6. If he doesn’t rest, he will not recover quickly.

→ Unless

7. If they don’t hurry, they will miss their flight.

→ Unless

8. If I don’t pass the exam, I cannot enroll in the course.

→ Unless

9. If we don’t conserve water, we will face a shortage soon.

→ Unless

10. If you don’t follow the instructions, the device may not work properly.

→ Unless

Đáp án:

1. Unless you call him today, you will miss the opportunity.

2. Unless they check the system, it might fail.

3. Unless we leave now, we will be late.

4. Unless she apologizes, I won’t forgive her.

5. Unless you pay your bills on time, you will be charged a late fee.

6. Unless he rests, he will not recover quickly.

7. Unless they hurry, they will miss their flight.

8. Unless I pass the exam, I cannot enroll in the course.

9. Unless we conserve water, we will face a shortage soon.

10. Unless you follow the instructions, the device may not work properly.

Bài 5: Sắp xếp từ cho sẵn thành câu hoàn chỉnh sử dụng cấu trúc unless

1. You / hard / work / succeed / won’t / unless.

2. They / on time / won’t / unless / leave / early.

3. She / unless / appointment / cancel / won’t / her.

4. You / unless / wear / won’t / warm / jacket / a.

5. He / unless / study / pass / won’t / the exam.

6. We / the tickets / won’t / unless / book / early / get.

7. They / unless / invite / won’t / the party / attend.

8. She / tired / unless / early / go / won’t / to bed.

9. You / unless / the instructions / follow / won’t / succeed.

10. He / upset / unless / he / apologize / won’t / be.

Đáp án:

1. Unless you work hard, you won’t succeed.

2. Unless they leave early, they won’t arrive on time.

3. Unless she cancels the appointment, she won’t go.

4. Unless you wear a warm jacket, you won’t be warm.

5. Unless he studies, he won’t pass the exam.

6. Unless we book the tickets early, we won’t get them.

7. Unless they are invited, they won’t attend the party.

8. Unless she goes to bed early, she won’t be tired.

9. Unless you follow the instructions, you won’t succeed.

10. Unless he apologizes, he won’t be upset.

Bài 6: Viết lại các câu sau.

1. If you don’t go out more often, you won’t be able to make new friends.

Unless _______________________________________________________.

2. If the preparation is not completed by tomorrow, we will have to postpone the opening.

Unless ____________________________________________________ .

3. Unless we take some measures now, we may have serious matters latter.

If _____________________________________________________________ .

4. He won’t come unless you invite him personally.

___________________________________________________________ .

5. If the director doesn’t arrive on time, the meeting will have to be cancelled.

Unless _____________________________________________________ .

Đáp án:

1. Unless you go out more often, you won’t be able to make new friends.

2. Unless the preparation is completed by tomorrow, we will have to postpone the opening.

3. If we don’t take some measures now, we may have serious matters latter.

4. He won’t come if you don’t invite him personally.

5. Unless the director arrives on time, the meeting will have to be cancelled.

Bài 7: Từ các câu trả lời có trong ô trống, chọn đáp án đúng. 

1.  you stop eating, you won't lose weight.

2. The manager will be furious  you don't fill up those empty shelves now. 

3. I'll be freezing out there  you wear some proper clothes. 

4. We cannot go to the soccer field  the rain stops. 

5. The report cannot be finalized  you don't finish up your part now. 

6. She is not allowed into the building  she provides some kinds of identification. 

7. We should be there by 9:30  the traffic is not too crowded.

8. The match will have to be postponed  the weather gets better. 

9. He will cook dinner tonight  they decide to go out.

10.  you provide some assistances, he won't be able to do the project alone

Đáp án:

1. Unless

2. if

3. unless

4. unless

5. if

6. unless

7. if

8. unless

9. unless

10. Unless

Bài 8 Viết lại câu có nghĩa không đổi

1. If Nam doesn’t speak English everyday, he will easily forget how to use it.

=> Unless ………………………………………………………………..

2. If you don’t practice harder, you will lose in the next game.

=> Unless ………………………………………………………………..

3. Unless students don’t return books to the library this week, they’ll have to pay a fine.

=> If ………………………………………………………………..

4. If our team had joined the competition, we would not have achieved this prize.

=> Unless ………………………………………………………………..

5. If Peter didn’t study hard, he could not get high marks.

=> Unless ………………………………………………………………..

Đáp án:

1. Unless Nam speaks English every day, he will easily forget how to use it.

2. Unless you practice harder, you will lose in the next game.

3. Unless students return books to the library this week, they will have to pay a fine.

4. If our team had not joined the competition, we would not have achieved this prize.

5. Unless Peter studied hard, he could not get high marks.

Bài 9: Chọn đáp án đúng

1. Peter said: “Don’t call me ______it’s an emergency” .

A. if

B. unless

C. that

2. __ we have enough time tomorrow, we will come to the library.

A. If

B. Unless

C. If not

3. We won’t be able to do it on time __ you help us.

A. unless

B. if

C. as much as

4._ Lisa arrives late, we will go to the park without her.

A. Unless

B. Not unless

C. If

5. I won’t go to the museum alone __ you agree to go with me.

A. so that

B. unless

C. if

6. Linh will go to work on time -_______she is sick.

A. as far as

B. unless

C. if

7. ______she studied harder, she would not get a scholarship this semester.

A.Unless

B. If

C. As long as

8. _ Laura doesn’t prepare an answer for the interview, she will fail.

A. If

B. Unless

C. Otherwise

9. Stop shopping, if you want to save money.

A. Unless you stop shopping, you will save money

B. If you don’t stop shopping, you will save money.

C. Unless you stop shopping, you won’t save money

10. My brother never plays games with me __ I beg for him.

A. unless

B. as much as

C. provided

Đáp án:

1. B

2. A

3. A

4. C

5. B

6. B

7. A

8. A

9. C

10. A

Bài 10: Viết lại câu với unless hoặc If not sao cho nghĩa không thay đổi.

1.1 If you don’t like this city, you can go anywhere you like. (Unless)

1.2 David wouldn’t have sold the car if his mom hadn’t told him so. (Unless)

1.3 My dad would not pay so much money unless he had a cancer. (If not)

1.4 Unless you do the homework, the teacher will give you a bad grade. (If not)

1.5 If there is no one seeing the murderer, he cannot be caught by the police. (Unless)

Đáp án:

1.1 Unless you like this city, you can go anywhere you like.

1.2 David wouldn’t have sold the car unless his mom had told him so.

1.3 My dad would not pay so much money if he didn’t have a cancer.

1.4 If you don’t do the homework, the teacher will give you a bad grade.

1.5 Unless there is someone seeing the murderer, he cannot be caught by the police.

Bài 11:  Điền “If” hoặc “Unless” vào chỗ trống.

2.1 …………. you are on time for the training today, I won’t let you play in tomorrow’s match.

2.2 The car will break down on the way ………… you don’t do the regular maintenance.

2.3 Anne will accept the job offer …………. the salary is too low.

2.4 …………. there had been a power cut, he would have been able to pick up the phone.

2.5 We could eat the apples …………… there was a knife here.

Đáp án:

2.1 Unless

2.2 If

2.3 Unless

2.4 Unless

2.5 If

Bài 12: Viết lại câu dưới đây sử dụng cấu trúc unless

1. If Seokjin doesn’t come to the party, I’ll be really bored. 

2. If you contract this project, you will make a lot of money.

3. We talk to her when Linh apologizes. 

4. Her father will let her go out if she promises to be back before midnight. 

5. If you don’t feed your baby more milk, she will cry louder.

6. If your friends don’t buy a good compass, they will lose their way. 

7. Martha won’t buy her a new car unless she gets paid soon. 

8. If Hùng answers incorrectly, the exam will fail. 

9. If Margaret does not quit smoking, she will get lung cancer. 

10. If you are not fluent in Spanish, they will not give you the job. 

11. If Patricia doesn’t go shopping, Paul will be very angry. 

12. If you don’t answer, I won’t lend you my long black dress. 

Đáp án:

1. I’ll be really bored unless Seokjin comes to the party. 

2. You won’t make a lot of money unless you contract this project. 

3. We won’t talk to her unless Linh apologizes 

4. Her father won’t let her go out unless she promises to be back before midnight. 

5. The baby will cry louder unless you give her some more milk. 

6. Unless they buy a good compass, your friends will get lost. 

7. Marthe won’t buy her a new car unless she gets paid soon.

8. Hung won’t fail the exam unless he answers correctly. 

9. Margaret will get lung cancer unless she gives up smoking. 

10. Unless you speak Spanish fluently, they won’t give you the job. 

11. Unless Patricia does the shopping, Paul will get very angry 

12. I won’t lend you my long black dress unless you lose weight.

Bài 13:  Điền vào chỗ trống để hoàn thành các câu sau, sử dụng cấu trúc unless hoặc if.

1. ___________ Linda supports me, I won’t be able to do it.

2. ___________ I meet Tony, I will tell him what happened.

3. You won’t be healthy _________ you start doing exercises.

4. ___________ you study harder, you won’t get good mark at the exam.

5. Your mother will be sad ________ you don’t do the homework.

6. You can’t go to Da Lat ________ you don’t save money now.

7. You will have a headache __________ you wear a hat.

8. Don’t call me __________ it’s an important situation.

9. _________ the weather is bad tomorrow, we won’t go camping.

10. __________ you don’t drive carefully, we will have an accident.

Đáp án:

1. Unless

2. If

3. unless

4. Unless

5. if

6. if

7. unless

8. unless

9. If

10. If

Bài 14: Viết lại các câu sau

1. You must try a bit harder or You won’t have a driver’s license.

=> You won’t pass the exam …………………….………….………….………….

2. Listen carefully or you will mistake

=> You won’t know what to do …………………….………….………….………….

3. She must apologise to me or I’ll never meet to her again.

=> ……………….………………….….………….………….………….………….

4. You have to speak very slowly or he won ‘t be able to understand you.

=> ……………….………….………….………….………….………….………….

5. The company must change or it will go bankrupt

=>…………...….………….………….………….………….………….………….

6. The club isn’t open to everyone. You ‘re allowed in only if you’re a member.

=> You …………………….………….………….………….………….…………….

7. I don’t want to go out alone if I’m with you.

=> I’m not going …………………….………….………….………………….………

8.  Don’t worry about the dog. It will attack you only if you move suddenly.

=> The dog …………………….………….………….………………….………….

9. Ben is lazy person. He’ll only does things if you push him.

=> Ben …………………….………….………….………………….………….………

10.  Today is a public holiday. The doctor will see you only if it’s an emergency.

=> The doctor …………………….………….………….………………….…………

Đáp án:

1. You won’t have a driver’s license unless you work hard.

2. You will make a mistake unless you listen carefully.

3. I’ll never meet to her again unless she apologises to me. or Unless she apologises to me, I’ll never meet to her again

4. He won’t be able to understand you unless you speak very slowly. or Unless you speak very slowly, he won’t be able to understand you

5. The company will have to bankrupt unless it change.

6. You aren’t allowed in the club unless you’re a member.

7.  I’m not going out alone unless I’m with you.

8.  The dog won’t attack you unless you move suddenly.

9.  Ben will does things unless you push him

10. The doctor won’t see you unless it’s an emergency.

Bài 15: Viết lại câu sao cho nghĩa không đổi. 

1. Unless you exercise regularly, you won’t stay fit.

2. Unless they leave now, they will miss the train.

3. Unless you pay the bill, they won’t deliver the package.

4. Unless you eat breakfast, you will feel hungry later.

5. Unless he arrives on time, he will miss the beginning of the movie.

Đáp án:

1. If you do not exercise regularly, you won’t stay fit.

2. If they do not leave now, they will miss the train.

3. If you do not pay the bill, they won’t deliver the package.

4. If you do not eat breakfast, you will feel hungry later.

5. If he does not arrive on time, he will miss the beginning of the movie.

Bài 16: Viết lại câu sau sử dụng Unless

1. She won’t pass the exam if she doesn’t study hard.

2. He won’t understand unless you explain it clearly to him.

3. They won’t win the match if they don’t work as a team.

4. She won’t get better unless she takes the medicine regularly.

5. They won’t win the match if they don’t work as a team.

Đáp án:

1. Unless she studies hard, she won’t pass the exam.

2. Unless you explain it clearly to him, he won’t understand.

3. Unless you explain it clearly to him, he won’t understand.

4. Unless she takes the medicine regularly, she won’t get better.

5. Unless they study harder, they won’t pass the test.

Bài 17: Viết lại câu sao cho nghĩa không đổi.

1. Unless he were absent now, he would meet the headmaster. 

=> If ………………………………………………………………… 

2. Unless Lan cleaned up the car now, her boss could ask her to do this. 

=> If ………………………………………………………………… 

3. If I didn’t know the number, I would not ring it up. 

=> Unless ………………………………………………………………… 

4. If Nam didn’t study hard, he could not get good marks. 

=> Unless ………………………………………………………………… 

5. If my son didn’t have a terrible headache he wouldn’t be absent from his class.

 => Unless …………………………………………………………………

Đáp án:

1. If he were not absent now, he would meet the headmaster. 

2. If Lan didn’t clean up the car now, her boss could ask her to do this. 

3. Unless I knew the number, I would not ring it up. 

4. Unless Nam studied hard, he could not get good marks. 

5. Unless my son had a terrible headache he wouldn’t be absent from his class.

Bài 18: Điền If hoặc Unless vào chỗ trống thích hợp 

1. I will take the job…………………… the pay is lower than my expectation.

2. How about going for a walk ……………………– you are too tired. 

3. I will be back…………………… there is a plane strike.

4. I think Lyly would look prettier…………………… she didn’t wear so much make-up.

5. I will be surprised…………………… he doesn’t have an accident.

6. I am going to work in the garden tomorrow,…………………… it rains.

7. ……………………you don’t stop smoking, you will be seriously ill.

8. ……………………I was rich, I would spend all my money traveling.

9. ……………………you start now, you will not be there in time.

10.…………………I have enough time, I will visit you.

Bài 19: Rewrite the sentences using unless. 

1. If you do not focus on the lesson, you will miss a lot of important knowledge. 

=> Unless …………………………………………………………………………………… 

2. If she does not practice speaking every day, she can not improve her speaking skill. 

=> Unless ………………………………………………………………………………………..

3. If you don’t return this book to the library today, you’ll have to pay a fine.

=> Unless ………………………………………………………………………………………

4. If my sister didn’t have a terrible headache she wouldn’t be absent from her class.

=> Unless ………………………………………………………………………………………..

5. If my sister did not go to the dentist, she would visit the museum with you. 

=> Unless ………………………………………………………………………………………..

6. If I didn’t know the number, I would not ring her up.

=> Unless …………………………………………………………………………………………

7. If he didn’t clean up the car now, his boss could ask him to do this.

=> Unless ………………………………………………………………………………………….

8. If they were not absent now, they would meet the headmaster.

=> Unless ……………………………………………………………………………………………

9. If this man is not a driver, he can’t help you move by car.

=> Unless …………………………………………………………………………………….

10. If you don’t go out more often, you might fall ill.

=> Unless ……………………………………………………………………………………

Đáp án:

1. Unless you focus on the lesson,  you will miss a lot of important knowledge. 

2. Unless she practices speaking every day, she can not improve her speaking skill. 

3. Unless you return this book to the library, you will have to pay a fine.

4. Unless my sister had a terrible headache she wouldn’t be absent from her class.

5. Unless my sister went to the dentist, she would visit the museum with you.

6. Unless I knew the number, I would not ring her up.

7. Unless he cleaned up the car now, his boss could ask him to do this.

8. Unless they were absent now, they would meet the headmaster.

9. Unless this man is a driver, he can’t help you move by car

10. Unless you go out more often, you might fall ill.

Bài 20: Điền Unless hoặc If vào chỗ trống:

1. I will take the job ________ the pay is too low.

2. Let’s go for a walk – ______ you are too tired.

3. I will be back tomorrow _______ there is a plane strike.

4. I am going to work in the garden this afternoon, ______ it rains.

5. I think she would look prettier ______ she didn’t wear so much make-up.

6. I will be surprised_______ he doesn’t have an accident soon.

7. ________ you don’t stop smoking, you will fall seriously ill.

8. ______ I were rich, I would spend all my time traveling.

9. _______ you start now, you will not reach there in time.

10. ______ I have enough time tomorrow, I will come and see you.

Đáp án:

1. Unless

2. Unless

3. Unless

4. Unless

5. If

6. If

7. If

8. If

9. Unless

10. If

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