英語四級重點(diǎn)短語講解 解析情態(tài)動詞+have
在英語四級考試的復(fù)習(xí)備考過程中，無論哪種題型，都會涉及到各類詞組、搭配和短語的`考查。因此，掌握一些考試必備的重點(diǎn)短語，會提高分?jǐn)?shù)大有裨益。今天，北外網(wǎng)課(北京外國語大學(xué)網(wǎng)絡(luò)課堂)老師就針對其中的一個典型用法情態(tài)動詞+have+過去分詞，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。
---Ought he to go?
---Yes. I think he ought to.
形容要求，命令時，語氣由should(應(yīng)當(dāng))、had better最好)、must(必須)漸強(qiáng)。
1) must have +done sth，對過去時間里可能出現(xiàn)事情的推測，語氣較強(qiáng)，具有"肯定"，"勢必"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形容過去，推測過去時間里可能出現(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 本來應(yīng)當(dāng)做某件事，而事實(shí)上并沒有做。否定句形容"不該做某件事而做了"。ought to在語氣上比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本來沒必要做某件事
I dressed very warmly for the trip, but Ineedn't have done so.
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