Read the sentences and complete the rules with have to, don't have to, must or mustn't
1 We use .... and ... for things that are necessary or obligatory.
2 We .... use for things that are not necessary (but we can do them if we want).
3 We use .... for things that we can't do because we don't have permission.
1 We use .... and ... for things that are necessary or obligatory.
2 We .... use for things that are not necessary (but we can do them if we want).
3 We use .... for things that we can't do because we don't have permission.
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1 We use have to and must for things that are necessary or obligatory.
2 We use don't have to for things that are not necessary (but we can do them if we want).
3 We use mustn't for things that we can't do because we don't have permission.