 22  s Could you open the window? s Could you give me your name, please? Could is also the past of can. We use it to talk about things we were able to before: s I could skate very well when I was young s Jane could walk before she was one year old Unit 19 must/have to Obligation We use must when we believe something is necessary:  ■ It’s a great book, you must read it ■ I must call my parents tonight ■ You must come over for dinner We use have to when we are obliged to do something, even if we don’t want to do it. ■ I have to get up early for work tomorrow ■ I have to complete my tax return before Friday ■ Do I have to?  Prohibition When something is not permitted, we use mustn’t: ■ You mustn’t smoke here, it’s forbidden ■ It’s a secret, you mustn’t tell anyone Don’t have to Don’t have to is not the same as mustn’t  22 |
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