1) must表示的是说话人的主观看法,而have to则往往强调客观需要,例如:
The play is not interesting. I really must go now.
I had to work when I was your age.
2) 两者的否定意义大不相同。例如:
You mustnt go. (你不可以去) You dont have to go. (你不必去)
3) 询问对方的意见时应用must。
Must I hand in the exercise book before eight?
4) must 表示偏偏
Must it rain today? (今天怎么偏偏下雨呢?)
四. dare 和need的用法
1. need表示需要,必须,作情态动词时,仅用于疑问句和否定句,在肯定句中一般用must, have to, ought to,或should代替。例如:
You neednt come so early.
Need I clean all the room right now? Yes, you must. ( No, you neednt.)
注意:neednt + have +done表示本来不必要做的事而实际上做了,例如:
You neednt have waited for me. 你本来没有必要等我的。
2. dare作情态动词时,主要用于疑问句,否定句和条件句中,一般不用于肯定句,例如:
How dare you take my book without permission?
He dare not speak English before such a crowd, dare he?
【【高二英语】语法:情态动词讲解】相关文章:
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