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can/must/have to/need/do
==========================

情态动词的用法集合


:term:`情态动词 must`

:term:`情态动词 can`

:term:`禁令`

:term:`must 和 can't`

:term:`had better 与 must`

:term:`must/have to/needn't`

:term:`情态动词 may`