
| 情态动词 | 用法 | 否定式 | 疑问式与简答 | 
| can | 
				能力(体力,智力,技能) 允许或许可(口语中常用) 可能性(表猜测,用于否定句或疑问句中)  | 
			can not / cannot /can’t do | 
				Can…do…? Yes,…can. No,…can’t.  | 
		
| could | couldn’t do | ||
| may | 
				可以(问句中表示请求) 可能,或许(表推测) 祝愿(用于倒装句中)  | 
			may not do | 
				May…do…? Yes,…may. No,…mustn’t/can’t.  | 
		
| might | might not do | 
				Might…do…? Yes,…might No,…might not.  | 
		|
| must | 
				必须,应该(表主观要求) 肯定,想必(肯定句中表推测)  | 
			must not/mustn’t do | 
				Must…do…? Yes,…must. No,…needn’t/don’t have to.  | 
		
| have to | 只好,不得不(客观的必须,有时态人称变化) | don’t have to do | 
				Do…have to do…? Yes,…do. No,…don’t.  | 
		
| ought to | 应当(表示义务责任,口语中多用should | ought not to/oughtn’t to do | 
				Ought…to do…? Yes,…ought. No,…oughtn’t.  | 
		
| shall | 
				将要,会 用于一三人称征求对方意见 用于二三人称表示许诺、命令、警告、威胁等  | 
			shall not/shan’t do | 
				Shall…do…? Yes,…shall. No,…shan’t.  | 
		
| should | 
				应当,应该(表义务责任) 本该(含有责备意味)  | 
			should not/shouldn’t do | Should…do…? | 
| will | 
				意愿,决心 请求,建议,用在问句中would比较委婉  | 
			will not/won’t do | 
				Will…do…? Yes,…will. No,…won’t.  | 
		
| would | would not/wouldn’t do | ||
| dare | 敢(常用于否定句和疑问句中) | dare not/daren’t do | 
				Dare…do…? Yes,…dare. No,…daren’t.  | 
		
| need | 
				需要 必须(常用于否定句和疑问句中)  | 
			need not/needn’t do | 
				Need…do…? Yes,…must. No,…needn’t.  | 
		
| used to | 过去常常(现在已不再) | 
				used not/usedn’t/usen’t to do didn’t use to do  | 
			
				Used…to do…? Yes,…used. No,…use(d)n’t. Did…use to do…? Yes,…did. No,…didn’t.  |