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在過去的時間里，兩個動作中，發(fā)生在前的那個動作要用過去完成時。
結(jié)構(gòu)：had+過去分詞
After she had finished her homework, she went shopping.
They had sold the car before I asked the price.
The train had left before I arrived at the station.
After/before引導(dǎo)的時間狀語從句放在句首要在句子后面加逗號，如果放在主句后則不用加。
1. 變疑問句將助動詞移到句首. Had she finished her homework?
2. 變否定句在助動詞后面加not. She hadn’t finished her homework.
3. 肯定回答及否定回答. Yes, she had. No, she hadn’t.
4. 特殊疑問句： What had she done?
構(gòu)成：主語+助動詞have, has+過去分詞
用法： 1) 表示過去發(fā)生的和現(xiàn)在有某種聯(lián)系的動作，常和just, usually, already, since等時間副詞連用
I have just had lunch. (飽了，不用再吃了)
He has had a cup of tea.(不渴了，不用再喝)
They have already had their holiday. (不能再度假了)
The boy has already read the book. (已經(jīng)知道書的內(nèi)容了，不用再看了)
2) 詢問別人是否做過某事一般用現(xiàn)在完成時：
Have you finished your homework?
Have you been to Beijing?
Have he seen the film?
3) 表示開始于過去并持續(xù)到現(xiàn)在的動作
I have lived in Beijing for twenty years.
I have worked for this school for 1 year.
4) 表示一種經(jīng)歷，經(jīng)驗：去過…地方，做過…事情，經(jīng)歷過…事情
I have never had a bath.
I have never seen a film.
I have never been to cinema.
I have ever been to Paris.
Have been to表示去過，have gone to 表示去了
I have been to London.(人已經(jīng)回來)
He has gone to London.(人還在那里)
5) 表示一種結(jié)果， 一般不和時間副詞聯(lián)用
I have lost my pen.
I have hurt myself.
He has become a teacher.
She has broken my heart.
句型變化：★變疑問句將助動詞移到句首，變否定句在助動詞后面加not.
Have you lost your pen? I have not lost my pen.
★肯定回答及否定回答
Yes, I have. No, I have not.
★特殊疑問句：
What have you done?
What has he done?
一般過去時與現(xiàn)在完成時的區(qū)別：凡是有明確的表示過去的時間狀語的句子為過去時。
注意：有些動詞表示的動作有一個終點，不能再延續(xù)，因此不能和表示一段時間狀語連用.
錯：I’ve left Beijing for 3 days.
對：I left Beijing 3 days ago. I have been away from being for 3 days.
表示過去發(fā)生的動作或事件， 常和表示過去的時間狀語連用，如yesterday, last night, the day before yesterday, 3 days ago,
含有be動詞的句子， 將動詞變?yōu)檫^去式，am, is的過去式為was，are的過去式為were.如：I was at the butcher’s.
You were a student a year ago.
The teacher was very beautiful ten years ago.
★變疑問句將be動詞移動到句首
Were you at the butcher’s?
Were you a student a year ago?
Was the teacher very beautiful ten years ago?
★變否定句在be動詞后面加not
I was not at the butcher’s.
You were not a student a year ago.
The teacher was not very beautiful ten years ago.
★肯定回答否定回答
Yes, I was. No, I was not.
Yes, you were. No, you were not.
Yes, he/she was. No, he/she was not.
★特殊疑問句：
What did you do? (必背)
不含有be動詞的句子，將動詞變?yōu)檫^去式
I finished my homework yesterday.
The boy went to a restaurant.
The Sawyers lived at King Street a year ago.
★變疑問句在句首加did， 動詞變?yōu)樵?BR> Did you finish your homework yesterday?
Did the boy go to a restaurant?
Did the Sawyers live at King Street a year ago?
★變否定句在主語和動詞之間加did not
I did not finish my homework yesterday.
The boy did not go to a restaurant.
The Sawyers did not live at King Street a year ago.
★肯定回答及否定回答
Yes, I did. No, I didn’t.
Yes, he did. No, he didn’t.
Yes, they did. No, they did not.