Have to, Used to say that something is necessary. You have no choice., Don't have to, Used to say that something is not necessary. You have a choice., Must, Used to say that something is an obligation. You have no choice.., May, Used to say that something has a high possiblity of happening., Might, Used to say that something has a possiblity of not happening., Should, Used to give advice, recommendations, and future probable expectations., Must not (Mustn't), Used to say that something is prohibited. It is essential you do not do it..

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