Can, you are allowed , Can't, you aren't allowed , Must, you are obliged to (it's a rule), Mustn't, it's forbidden, Have to, need , it's necessary, Don't have to, it isn't necessary, Might, it's just possible, May , you can, it's okay, Should, it's a good idea, I advice , Shouldn't, it isn't a good idea, Can I, Is it OK if I....?, Could I, Is it possible...? (But more polite).

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