备注
must
必须
①We must help each other to overcome the difficulties. ②—Must I finish the work today?—No, you needn't/you don't have to./Yes, you must. ③You mustn't take photos here, and it is forbidden.
①must表示主观意志,have to表示客观。如:They had to speed up, for the weather turned terrible. ②Must I/we…?的否定回答不能用mustn't。
偏要
硬要
非要 ①Why must you always interrupt me?
②—Can I borrow your car, Mum?—If you must.
表示与说话人愿望相反及不耐烦。
情态动词 意义
例句
备注
should
应该(常与oughtto通用) You should be polite to the old.
ought to 的否定式:ought not to(oughtn't to);疑问式:Ought …to…?
竟然
It is strange that he should react in this way.
表示惊讶、意外等语气。
万一
①Should anyone phone, tell them I will call back later. (= If anyone should phone…)②If I should go there tomorrow, I would go to see her.
用于if从句中强调“万一”,或用于虚拟语气。
3. need, dare
情态动词 例句
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