5.3 must We use must + bare infinitive to • say that something is necessary. All ____ must be returned at the end of the day. • talk about obligations. You ____ answer all the questions. • show that we are sure that something is true. He must ____ very ambitious as he works so hard. • recommend something. You must ____ this article. It's great. We use mustn't + bare infinitive to talk about something that is not allowed. You mustn't take things without asking.

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