★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，動詞過去式構(gòu)成見附錄
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.
4. 現(xiàn)在完成時
構(gòu)成：主語+助動詞have, has+過去分詞
用法：
2) 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）
3) 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?
4) 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.