因此, 你的分类并不全面
[常用的分类, 不包括全部情态动词]
1.能力
can/could (有时需使用be able to, manage to)
The baby can't(couldn't) dress himself.
2.许可
can/(could)/may/(might)
Can/May I watch TV tonight?
Yes, you can/may.
3.命令与禁令
must (not), will(军令式的粗暴命令), [shouldn't]
You mustn't play now!
You will finish the job tomorrow!
[据 Practical English Usage, 表示一种强制的,粗暴的命令, 就像预言未来必定发生的事件一般]
4.必要性
must, need, should, ought to, need (not)
Must/Need I come here tomorrow?
No, you needn't.
You should/ought to come here on time.
5.推测
can (not), could (not), must, might (not), may (not)
It can't be!
It must be Tom.
He may be in the office.
6.建议
[should 更常见于 虚拟语气中] had better
I suggest that you should bring some pork tomorrow.
He had better do something for his family, hadn't he?
(注意Tag Question疑问尾句的变化)
另外,情态动词必须带 [不加to的动词不定式] 也就是原形,因此 need to do/need doing的用法不属于情态动词(显然,need这时候有人称变化)
要知道详细的用法, 请查阅一本好的语法书
(A Practical English Grammar, 薄冰, ....)
need需要
should't不应该
You need to rest
You shouldn't rest
can能力,may请求,must命令,should建议,can't猜测,mustn't禁止.对吗...
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您好：can't needn't mustn't Could,must may Could should must,needn't may,mustn't could 希望我的回答帮得到您，来自【百度懂你】团队，满意请采纳噢~O(∩_∩)O~
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I must do my homework everyday.我必须每天做我的家庭作业。I do that you may know my plans.我那么干是为了让你知道我的计划。I can swim.我会游泳。You musn't somke here.这里禁止吸烟。I can‘t swim.我不会游泳。Could you help me ?你可以帮助我吗？I would like a cup of ...
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must．是的，必须天亮前来。—No,you needn't．不必天亮前就来。—No,you don't have to．不必天亮前就来。2．—May I smoke in the room？我可以在这个房间抽烟吗？—Yes,you may．当然可以。—Of course you may[can]．当然可以。—No,you may not[mustn't，can't]．不行。（语气较...
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