情态动词都有哪些

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