Must, mustn't, have to, don't have to, should & shouldn't
Help
You ____ apologise; it isn't necessary. It was just an accident and no one is angry with you.
don't have to
You tell ____ anyone what I just told you. It's a secret and Anna will kill me if she finds out!
mustn't
The museum is free, so you ____ pay to get in. But you can give them some donation if you like the place.
don't have to
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