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Unit four

Learn how to use different phrases to express permission and obligation in English sentences. Understand the differences between "can," "should," "must," and "have to." Explore examples and practice exercises.

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Unit four

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  1. Doing the right thing Unit four

  2. Answers 1) I can't go. I shouldn't go. I mustn't go. I don't have to go. 2) Can I go? Should I go? Must I go? Do I have to go? 3 ) He / She can go. He / She should go. He / She must go. He / She has to go.

  3. Use

  4. Answers : • I am allowed to/ can ... mean the same . They express permission . • I have to... expresses obligation. • Answers • Children have to go to school. • Millionaires don't have to work. • You don't have to go to England if you want to learn English. • In England , you have to drive on the left.

  5. Answers • 2) I don't have to wear a uniform. • Do I have to wear a uniform. • I had to wear a uniform. • 3 ) She doesn't have to work hard . • Does she have to work hard1 • She didn't have to work hard. • 4) He can't do what he likes. • Can he do what he \ likes? • He couldn't do what he liked. • 5) We aren't allowed to wear jeans. • Are we allowed to wear jeans? We were allowed to wear jeans.

  6. Answers • The sentence with must expresses strong obligation . • Should and must are model auxiliary verbs .

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