英语四级重点短语讲解解析情态动词+have

时间：2021-01-29 11:50:58 英语四级我要投稿

　　在英语四级考试的复习备考过程中，无论哪种题型，都会涉及到各类词组、搭配和短语的`考查。因此，掌握一些考试必备的重点短语，会提高分数大有裨益。今天，北外网课(北京外国语大学网络课堂)老师就针对其中的一个典型用法情态动词+have+过去分词，为大家进行详细讲解。

英语四级重点短语讲解解析情态动词+have

　　should和ought to should和ought to都为"应当"之意，可用于各种人称。

　　---Ought he to go?

　　---Yes. I think he ought to.

　　形容要求，命令时，语气由should(应当)、had better最好)、must(必须)渐强。

　　1) must have +done sth，对过去时间里可能出现事情的推测，语气较强，具有"肯定"，"势必"之意。

　　---Linda has gone to work, but her bicycle is still here. ---Shemust have gone by bus.

　　2) may(might) have + done sth, can (could) have + done sth形容过去，推测过去时间里可能出现的事情。

　　Philip may (might) have been hurt seriously in the car accident.Philip can (could) have been hurt seriously in the car accident.

　　3) ought to have done sth, should have done sth 本来应当做某件事，而事实上并没有做。否定句形容"不该做某件事而做了"。ought to在语气上比should要强。

　　He ought not to have thrown the old clothes away.

　　You ought to (should) have been more careful in this experiment.

　　4) would like to have done sth本来打算做某件事

　　I would like to have read the article, but I was very busy then.

　　5) needn't have done sth本来没必要做某件事

　　I dressed very warmly for the trip, but Ineedn't have done so.

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