情態動詞和動詞原型連用，多表示對目前或將來情況的看法或態度，但情態動詞和完成時連用時，多用來表示對過去情況的看法或態度。
1. should+have+過去分詞 表示過去“本應該┅”。而實際上該動作并未做，暗示說話人對自己的責備，抱怨或遺憾的意思。
We should have cut away the jungle brush.
我們本應該把叢林的灌木砍掉。
How I regretted the days when I had played and should have studied.
我多么懊悔我把本應該好好學習的日子都玩掉了。
Shouldn’t+have+過去分詞表示過去“本不應該┅”而實際上做了的動作。
You shouldn’t have told anyone about it.
你本來不應該告訴任何人。
They shouldn’t have left so soon..
他們本來不應該去得那么早。
2. ought to + have + 過去分詞表示過去“本應該。。�！倍鴮嶋H上未做。相當于“should + have + 過去分詞”
You ought to have helped him.
你應該幫他一把。
You ought to have returned these books to the school library last week.
上周你就應該把這些書還給學校圖書室。
否定形式oughtn’t to + have + 過去分詞 = shouldn’t + have +過去分詞
eg. You oughtn’t to have taken his umbrella away.
你不該把他的傘拿走。
He oughtn’t to have been there.
他本不應該到那去。
3. must + have + 過去分詞表示對過去情況的推測，譯成“一定， 相必，可能”。
What a challenge I must have been to this young teacher.
對這位年輕教師來說，教我這樣的學生一定是個巨大的挑戰。
Since the ditch is full of water, it must have rained last night.
因為溝里漲滿了水，昨晚一定下雨了。
表示對過去情況的否定推測時。要用“can’t (couldn’t) + have + 過去分詞”，一般不用“mustn’t + have + 過去分詞”。
Joe can’t have left. I saw him just now.
喬不可能離開，剛才我還看見他了。
The party couldn’t have been successful as you had hoped.
舞會不可能象你希望的那樣成功。
“must + have + 過去分詞”表示對過去情況推測時，反意疑問句用have (has), 有明確表示過去時間的狀語（before 除外） 反意疑問句用did.
He must have finished his homework, hasn’t he?
他準把作業做完了。對嗎？
He must have attended the meeting yesterday evening, didn’t he?
他昨晚上肯定參加會議了，是嗎？
4. may (might) + have + 過去分詞表示對過去情況的推測。用might + have + 過去分詞可以用于肯定句，否定句，但不用于疑問句
In return I may have been able to teach you a little about medical technique.
作為報答，我也許教給了你們一點點醫療技術。
Might he have been caught and killed?
他有可能被抓住殺掉嗎？
Might + have + 過去分詞也能表示對過去的事情的可能性的推測，有“本應該。。�！�，但未實現的動作，含有婉轉責備的意思。
You might have listened to me while I was talking to you.
我對你講話時，你應該認真聽才對。
You might have let me know before you went out.
外出之前，你應該先告訴我。
5. can (could) + have +過去分詞表示對過去情況的推測�！癱an + have + 過去分詞”一般多用于疑問句和否定句， 不用于肯定句。
Can he have gone yesterday?
難道他昨天就已經走了嗎？
They can’t have lost themselves in the woods, because I drew a map to them.
他們不可能在森林中迷路，因為我給他們畫了一張畫。
Bill couldn’t have gone home this weekend. I saw him at the school ground this morning.
本周末貝爾不可能回家，今天下午我還在學校操場上看見他了。
“Can (could) + have + 過去分詞” 也表示過去“本應該。。�！倍醋觥�。。
John could have read his assignment while he waited for the doctor.
約翰在等醫生的時候應該看一下他的作業。
Mary can’t have gone to school. It’s Sunday.
瑪麗不可能去上學，今天是星期天。
在表示對過去某事的推測時，可用could/ might / may + 完成時。
They could/might/may have heard the news from smith.
他們也許從史蜜斯那兒聽到了這個消息。
6. need + have +過去分詞表示過去“沒有必要做”，有責備的意思。否定形式表示“做了本不應該。。。”的 事
Need you have watched TV last night?
你昨晚有必要看電視嗎？
You needn’t have woken me up so early. It’s Sunday today.
你沒有必要這么早就叫醒我，（因為）今天是星期天。
7. would + have + 過去分詞表示“本應該。。�！�，而未。。。
We would have argued with you.
我們當時應該與你們爭辯一下。
另外：would like to have + 過去分詞表示過去希望做。。。，但未。。。
I would like to have seen the film.
我希望我當時看了這部電影。
I would like to have met her.