1. Complete the sentences with the correct modal verb in italics:
- You couldn’t / mustn’t / shouldn’t eat so many hamburgers. They're not good for you.
- You can’t have / don’t have to /mustn’t study at the weekends, except when you have exams.
- You may not / might not /needn’t Everything will be OK.
- You don’t have to /might not/mustn’t use your mobile phone in class.
- Diana looks happy. She can /can have /must have heard some good news.
- I can’t /may not /might not have left my mobile phone at school on Friday afternoon – I had it on Friday night.
- It can /could / couldn’t rain tomorrow.
2. Rewrite the sentences using modal verbs
1. Some people just don’t know how to sing. (be able to)
2. There’s a chance that she’s in the airport. (could)
3. I knew how to ride a horse when I was six. (could)
4. John isn’t sure if he is going to Turkey. (might not)
5. Do not block the emergency exit. (mustn’t)
6. It is dangerous to use mobile phones on the plane. (mustn’t)
7. It is necessary to fasten your seat belt for landing and taking off. (must)
8. It’s possible that he’ll be there to meet us. (may)
9. This is a surprise. Don’t tell anybody about it. (shouldn’t)
3. Complete the sentences with a suitable modal verb. Use must, don’t have to, might, should, must have, mustn’t, can’t have and shouldn’t.
- You _________ drive on the pavement. It's illegal.
- You _________say that. It's not nice.
- I _________ go to work tomorrow because it's a public holiday.
- I _________ buy this CD, but I'm not sure.
- He's not here. He ______gone out.
- She didn't study enough. She _______passed her exam.
- You _______ eat more vegetables. They're good for you.
- You _______ be 18 before you can buy alcohol.
- It’s possible Mary saw him. (must / may / can)
Mary ___________
- I am certain Peter has got lost. (should / could / must)
Peter ___________
- My advice is that you stop. (should / must / could)
You _____________
- Perhaps we went to London. (must / can / might)
We _____________
- I am sure Pierre is French. (can / must / could)
Pierre ____________
- It’s not possible that Peter kissed Helen. (might not / can’t / should )
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