英文构成否定句及疑问句的助动词

如题所述

有be动词are, am, is,和助动词do, does, did
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第1个回答  2011-11-02
be动词:am,is,are,was,were。
情态动词:can,could,may,might,will,would,shall,should。
助动词:do,does,did。,
第2个回答  2011-11-04
有三种情况:
be 动词:am is are was were
情态动词:can could , may might , will would , shall should
助动词:do does did
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