Must: Obligatory, sure that, be required, compulsory, mandatory, essential, requisite, ought to, need , want, precondition, Needn't: No compulsory, no mandatory, Not have to, no need, no obligation, no obliged, not necessary, no demand, no prerequisite, Mustn't: be not allowed, be not permitted, Should: necessary, be advised, it's time + S + V, had better, have to, May/might: Likely, perhaps, probably, not sure that, possible, possibly,

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