英語(yǔ)四級(jí)重點(diǎn)短語(yǔ)講解 解析情態(tài)動(dòng)詞+have
在英語(yǔ)四級(jí)考試的復(fù)習(xí)備考過(guò)程中，無(wú)論哪種題型，都會(huì)涉及到各類(lèi)詞組、搭配和短語(yǔ)的`考查。因此，掌握一些考試必備的重點(diǎn)短語(yǔ)，會(huì)提高分?jǐn)?shù)大有裨益。今天，北外網(wǎng)課(北京外國(guó)語(yǔ)大學(xué)網(wǎng)絡(luò)課堂)老師就針對(duì)其中的一個(gè)典型用法情態(tài)動(dòng)詞+have+過(guò)去分詞，為大家進(jìn)行詳細(xì)講解。
should和ought to should和ought to都為"應(yīng)當(dāng)"之意，可用于各種人稱(chēng)。
---Ought he to go?
---Yes. I think he ought to.
形容要求，命令時(shí)，語(yǔ)氣由should(應(yīng)當(dāng))、had better最好)、must(必須)漸強(qiáng)。
1) must have +done sth，對(duì)過(guò)去時(shí)間里可能出現(xiàn)事情的推測(cè)，語(yǔ)氣較強(qiáng)，具有"肯定"，"勢(shì)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形容過(guò)去，推測(cè)過(guò)去時(shí)間里可能出現(xiàn)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 本來(lái)應(yīng)當(dāng)做某件事，而事實(shí)上并沒(méi)有做。否定句形容"不該做某件事而做了"。ought to在語(yǔ)氣上比should要強(qiáng)。
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本來(lái)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本來(lái)沒(méi)必要做某件事
I dressed very warmly for the trip, but Ineedn't have done so.
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