1) We use must and ... to talk about rules and things that are necessary. a) should b) had to c) mustn't d) have to 2) We use.... for rules in the past. a) must b) had to c) didn't have to d) should 3) We use ... when something isn't allowed by a rule. a) don't have to b) mustn't c) shouldn't 4) We use don't have to when smth isn't necessary. We use... when smth wasn't necessary in the past. a) shouldn't b) mustn't c) didn't have to 5) We use....to say smth is a good idea. a) must b) have to c) don't have to d) should 6) We use... to say smth isn't a good idea. a) don't have to b) mustn't c) shouldn't 7) We use...in questions to ask for advice. a) have to b) must c) should

have to, must, should

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