新东方网英语四级频道为备考英语四级的同学整理了英语四级词汇讲解及考点归纳，希望可以为大家带来帮助，一起来学习一下吧。
英语四级词汇讲解丨考点归纳：I have no idea
I had no idea that it closes so early on weekends.
四级词汇讲解:
I have no idea是“我不知道”的意思，与I don't know含义相同。I have no idea的后面可以像本句一样接从句，也可以什么都不接，用于回答别人的问话。
英语四级考点归纳：
英语中有一些表达偏向于用名词而不用动词。如:如果要说“我的舞跳得不好”，口语里很少用I don't dancewell.而是说I'm not good at dancing.或I am not a good dancer.又如“我歌唱得不太好”，就可以说I amnot a good singer.
英语四级语法：情态动词+ have +过去分词
大学英语四级语法大全目录
1) may(might) have + done sth, can (could) have + done sth 表示过去，推测过去时间里可能发生的事情。
Philip may (might) have been hurt seriously in the car accident.
Philip can (could) have been hurt seriously in the car accident.
2) must have +done sth，对过去时间里可能发生的事情的推测，语气较强，具有"肯定"，"谅必"的意思。
---Linda has gone to work, but her bicycle is still here.
---She must have gone by bus.
3) ought to have done sth, should have done sth
本应该做某事，而事实上并没有做。否定句表示"不该做某事而做了"。
You ought to (should) have been more careful in this experiment.
He ought not to have thrown the old clothes away.(事实上已扔了。)
ought to 在语气上比should 要强。
4) needn't have done sth 本没必要做某事
I dressed very warmly for the trip, but I needn't have done so. The weather was hot.
5) would like to have done sth 本打算做某事
I would like to have read the article, but I was very busy then.
From:https://www.zgghmh.com/CET-4/20004243.asp