【篇一】
表示過去發(fā)生的動(dòng)作或事件， 常和表示過去的時(shí)間狀語連用，如yesterday, last night, the day before yesterday, 3 days ago,
含有be動(dòng)詞的句子， 將動(dòng)詞變?yōu)檫^去式，am, is的過去式為was，are的過去式為were
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(dòng)詞移動(dòng)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(dòng)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(dòng)詞的句子，將動(dòng)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(dòng)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(dòng)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.
【篇二】
be動(dòng)詞（am、is、are）+not、
情態(tài)動(dòng)詞can+ not、
助動(dòng)詞（do、does） + not
如何將一個(gè)肯定的陳述句改為否定句：
1、看句中有無be動(dòng)詞，如有，直接在be動(dòng)詞后+ not。
2、看句中有無情態(tài)動(dòng)詞，如有，直接在情態(tài)動(dòng)詞后+ not。
3、如上述二者都沒有，就應(yīng)用助動(dòng)詞+ not。分四個(gè)步驟：
�。�1）肯定陳述句中本來是沒有助動(dòng)詞的，要加上去，位置在主語（某人或某物）后，動(dòng)詞前。
（2）確定助動(dòng)詞用do、does，根據(jù)句中動(dòng)詞，動(dòng)詞是原形的助動(dòng)詞就用do，動(dòng)詞是第三人稱單數(shù)的助動(dòng)詞就用does，
�。�3）在助動(dòng)詞后加not。
�。�4）原句中動(dòng)詞假如發(fā)生變化就要恢復(fù)成原形。
強(qiáng)調(diào)一點(diǎn)，有some的要考慮是否要用any。
