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3. Circle the correct option.
1 I’m not sure where Jane is. She could / must be at the office.
2 Sally has to / doesn’t have to pass all her exams because she wants to go to university.
3 You ought to / can check you have all the ingredients before you start making the cake.
4 The letter should / couldn’t arrive tomorrow. It was sent by express delivery.
5 You mustn’t / have to book the tickets soon, otherwise they’ll be sold out!
6 You don’t have to / mustn’t smoke at a petrol station. You can’t / could cause an explosion.
7 That painting is obviously a forgery. It mustn’t / can’t be by Van Gogh.
8 That doesn’t have to / can’t be right! The answers must / can be wrong.
4. Match the sentence beginnings (1-4) with the endings (a-d).
1. 1 You have to watch
2 You must watch
3 You mustn’t watch
4 You don’t have to watch
a that programme if you don’t want to.
b that programme – you’ll love it!
c too much TV. It’s bad for you.
d a lot of TV if you want to become a TV critic.
2. 1 You have to buy
2 You must buy
3 You mustn’t buy
4 You don’t have to buy
a any more books or you’ll spend all your money.
b the new book by Dan Brown. It’s incredible.
c the books – you can get them from the library.
d all the books before the course starts. It’s a university regulation.
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