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Ex. I. Use unless instead of if:

  1. If you don’t hurry up, you’ll miss the start of the film.

  2. If you don’t phone me first, I’ll phone you.

  3. You won’t recover if you don’t keep to bed.

  4. Your cold won’t go if you don’t call in a doctor.

  5. If you don’t leave me alone, I’ll call the police.

  6. If you don’t apologize, I’ll never talk to you again.

  7. If you don’t clean up this mess, I’ll have to do something about it.

Ex. II. Choose the correct word.

  1. I’ll buy the furniture unless/provided it isn’t too expensive.

  2. He won’t forgive you as long as/unless you say you are sorry.

  3. You can’t check out of a hotel provided/unless you’ve paid the bill.

  4. You can retire so long as/unless you have reached a certain age.

  5. Provided/unless you leave now, you’ll catch the train.

  6. You can borrow my book as long as/unless you return it tomorrow.

  7. I can’t write to you unless/provided you give me your address.

Ex. III. Make a new sentence using the words in brackets:

Example: If you don’t lend me your map, I’ll get lost. (or) Lend me your map or I’ll get lost.

  1. If you do as I say, everything will be all right. (and)

  2. If you don’t stop making that noise, I’ll hit you. (or)

  3. If you don’t drive more carefully, you’ll have an accident (or else)

  4. If you help me, I’ll help you. (and)

  5. If he comes late, the teacher will be angry. (or)

  6. If you don’t leave me alone, you’ll be sorry. (or)

  7. If you give me a prompt, I’ll make a new sentence. (and)

Ex. IV. Complete the sentences using should I/he/she and the verbs in the box:

Example: I think I’ll arrive at the meeting on time, but should I be late, please start without me.

  1. I think I’ve got enough money, but ______________ any more, I’ll borrow some.

  2. I’m sure he’ll pass the exam, but ______________ he can always take it again.

  3. I don’t think I’ll go to the party, but ____________ my mind I’ll let you know.

  4. She expects to catch the last bus, but ____________ it, she’ll take a taxi.

Ex. V. Review of Conditionals. Choose the most suitable verb form:

  1. If the machine stops/will stop, you press/will press this button.

  2. I can’t understand what he sees in her! If anyone treats/will treat/treated me like that, I am/will be/would be extremely angry!

  3. If you help me/helped me with this exercise, I will do/would do the same for you one day.

  4. According to the timetable, if the train leaves/left on time, we will/would arrive at 5.30.

  5. If it is/will be fine tomorrow, we go/ will go to the coast.

  6. If we find/found a taxi, we will get/would get there before the play starts.

  7. It’s quite simple really, if you take/will take/took the information into account.

8. Why didn’t you tell me? If you told/had told me, I had/would have helped you.

9. Let me give you some advice. If you smoked/would smoke/had smoked less, you didn’t feel/wouldn’t feel/ wouldn’t have felt so tired.

  1. What bad luck! If Alan didn’t fall/hadn’t fallen/wouldn’t fall over, he won/would win/would have won the race.

  2. Why didn’t you phone? If I know/had known/would know you were coming, I met/will meet/would have met you at the airport.

  3. If I phone/will phone/phoned you tonight, are you/will you be/would you be in?

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