高考英语总复习语法专项情态动词_高考语法

　　c. We had to stay there for a whole day because of the rain.

　　d. We have to practise a lot if we want to speak English well.

　　e. The situation has changed; we will have to change our plan.

　　③.它们的否定式mustnt / not have to有很大的不同: mustnt表示不要(做某事), 有禁止之意; not have to表示不必要(做某事), 含有客观上无此必要之意

　　a. You mustnt move a person if he is badly hurt.

　　b. You dont have to be a doctor to do first aid.

　　四.would的用法:

　　1.表示主观意志和愿望, 即愿意,想要

　　a. Come here whenever you would.

　　b. He would not leave before he finished his work.

　　2.would do sth可以表示过去经常发生的动作, 相当于used to do sth

　　a. When we were children we would go swimming every summer.

　　b. On Sundays he would go fishing for hours when he lived in the countryside.

　　3.表示请求, 愿望, 语气客气, 委婉

　　a. I would like some tea.

　　b. Would you mind closing the door ?

　　c. Would you tell me something about your trip ?

　　4.表示推测, 表示大概, 也许的意思

　　a. That would be the pen you are looking for.那也许是你在找的笔吧

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