【简明语法】21.7 情态动词+ have +过去分词
时间：2019-01-16 作者：英语课 分类：英文语法词汇
英语课
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 1.
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 2 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 3.
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 4 hot.
5) would 5 like to have done sth 本打算做某事
I would like to have read the article 6, but I was very busy then.
n.事故，意外的事
- He had a traffic accident.他出了交通事故。
- An accident was happened yesterday.昨天发生了一起事故。
v.aux.应该，大概；n.责任
- Ought I to hand in the homework today?我应当在今天交上作业吗？
- They ought to be here by now.他们这个时候该到了。
n.实验，试验，尝试；v.实验，尝试
- We decided to begin the experiment in the evening.我们决定晚上开始那个实验。
- Why did he do that experiment once again?为什么他再次做那个实验？
aux.will的过去式；愿，要；常常；大概；将要，会
- Why would you say that?为什么你会这么说？
- Would you please help me?你能帮帮我吗？