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情态动词本身有一定的词义，表示语气的单词。但是不能独立作谓语，只能和动词原形一起构成谓语。那么情态动词有哪些呢？下面是小编整理的详细内容，一起来看看吧！
情态动词有哪些英语单词
(1)只作情态动词：may，might，must...
(2)可作情态动词又可做实义动词：need，dare，can...
(3)具有情态动词特征：have(had，has)to，used to，ought to
(4)可做情态动词又可作助动词：shall(should)，will(would)
情态动词的功能
1）构成否定式：
He didn't go and neither did she.他没去，她也没去。
The meeting might not start until 5 o'clock.会议可能直到五点才开始。
2）构成疑问式或附加疑问式：
Must you leave right now?你一定要马上离开吗？
You have been learning French for 5 years,haven't you?你已经学了五年法语，不是吗？
3）构成修辞倒装：
Nowhere can he obtain any information about his sister.他无处得到他姐姐的任何消息。
Hardly had he arrived when she started complaining.他刚到，她就开始抱怨起来。
4）代替限定动词词组：
A: Who can solve this crossword puzzle?
B: Tom can.
A: Shall I write to him?
B: Yes,do.