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Must; may not; have to May; mustn’t; can Should; can’t; may Must; needn’t; have to
have to, may be, may needn’t, may have to, must
can’t be can’t have been may not be may not have been
mustn’t can’t may not needn’t
mustn’t；can needn’t；must don’t have to；may can’t have to；may
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mustn’t; may may not; must don’t have to; may shouldn’t; must
mustn’t can’t may not needn’t
must, mustn’t must , don’t have to may, needn’t may , mustn’t
have to, may be, may needn’t, must have to, must
may have needn’t have couldn’t have must have
may not needn't can't don't have to
mustn’t can’t may not needn’t
may, mustn’t must, can’t may, may not must, needn’t
mustn’t ,may may not, must don’t have to, may shouldn’t, must
needn’t; have to needn’t ; must mustn’t; have to mustn’t; has to
mustn’t; may may not; must don’t have to; may shouldn’t; must
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