FCE1 - Grammar: Obligation and necessity

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Fill in the blank with the correct form of MUST or HAVE TO. The monitors ---- be cleaned before leaving every night. That's number 1 rule.

have to / We use 'have to' for facts. 'You have to do something' because of a rule or the situation.

Fill in the blank with must, mustn't, have / has (not) , needn't. Those who finish their exam ---- start making noise.

mustn't / You mustn't do something = it is necessary that you do not do it.

Complete the sentences with MUST or HAVE TO in the correct form. When you come to London again, you ----- some and see us.

must / MUST is personal. We use 'must' when we give our personal feelings.

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