I- Fill in the blanks with: should, has to, don’t have to, might, must, mustn’t, must have been, can’t, could, couldn’t: (More than one answer is sometimes possible.)

1. She looks pretty sick. I think she should/ has to/must go to a doctor. (advice/strong advice with have to/must)

2. You've been driving all day. You must be exhausted! (certainty)

3. You mustn’t smoke so much. It's bad for your health. (prohibition)

4. I can’t believe that you failed your test! (impossibility)

5. The book is optional. My professor said we could read it if we needed extra credit. But we don’t have to read it if we don't want to.(possibility (could)/ lack of obligation/necessity ( don’t have to=needn’t)

6. Susan couldn’t hear the speaker because the crowd was cheering so loudly. (impossibility)

7. The television isn't working. It must have been damaged during the move. (certainty in the past: must have+past participle) only in this sentence, the verb is in the passive voice, that’s why we have got two participles: be (been) and damage (damaged)

8. He can’t be from the USA. He does not speak English. (impossibility)

9. They may be away for the weekend but I am not sure. (probability)

10. We might travel tomorrow if the weather is nice.

II- Choose the right answer:

1. When you come to the crossroads, stop there.
a- Remember to stop at the crossroads.
b- Remember stopping at the crossroads.
c- Both possibilities are correct.

2. Yesterday she read the first pages of her new book.
a- She began to read her new book.
b- She began reading her new book.
c- Both possibilities are correct.

3. I was talking to Marc. But when my friend came in, I could not talk to Marc anymore.
a- I stopped to talk to him.
b- I stopped talking to him.
c- Both possibilities are correct.

4. I wanted to write a letter, but I didn’t know what to write. (So in the end, I didn’t write one.)
a- I tried to write a letter.
b- I tried writing a letter.
c- Both possibilities are correct.

5. I am sorry now for something I said earlier on.
a- I regret to say this.
b- I regret saying this.
c- Both possibilities are correct.

Regret to say something = You are sorry to say something.
Regret saying something= You wish you hadn't said something.
I regret doing something = I did it and now I'm sorry about it:
• I now regret saying what I said. I shouldn’t have said it.

I regret to say / to tell you / to inform you
= I'm sorry that I have to say (etc.):
• (from a formal letter) We regret to inform you that we are unable to offer you the job.

6. The joke was so funny that he burst out in laughter.
a- He started to laugh.
b- He started laughing.
c- Both possibilities are correct.

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