情态动词都有哪些qiouqiou
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情态动词都有哪些qiouqiou情态动词都有哪些qiouqiou情态动词都有哪些qiouqiou情态动词有四类：①只做情态动词：must,can(could),may(might),oughtto②可
情态动词都有哪些qiouqiou
情态动词都有哪些
qiouqiou
情态动词都有哪些qiouqiou
情态动词有四类：
①只做情态动词：must,can(could),may(might),ought to
②可做情态动词又可做实义动词：need,dare
③可做情态动词又可做助动词：shall(should),will(would)
④具有情态动词特征：have(had,has) to,used to
can can't
do don't
would
should shouldn't
can could may might need(情态和实意都有) should must shall