★變疑問(wèn)句在句首加do
Do you want to have a bath?
Do we have any meat?
Do the students like smart teachers?
★變否定句在主語(yǔ)和動(dòng)詞之間加don’t.
You don’t want to have a bath.
We don’t have any meat.
The students don’t like smart teachers.
★肯定回答及否定回答
Yes, I do. No, I don’t.
Yes, we do. No, we don’t
Yes, they do. No, they don’t.
2. 現(xiàn)在進(jìn)行時(shí)
表示現(xiàn)在正在進(jìn)行的動(dòng)作。
構(gòu)成： 主語(yǔ)＋be動(dòng)詞＋動(dòng)詞的現(xiàn)在分詞＋其它成分（現(xiàn)在分詞的構(gòu)成見(jiàn)附錄）
We are having lunch.
He is reading a book.
The dog is running after a cat.
The boys are swimming across the river.
★變疑問(wèn)句將be動(dòng)詞移到句首
Are we having lunch?
Is he reading a book?
Is the dog running after a cat?
Are the boys swimming across the river?
★變否定句在be動(dòng)詞后面加 not
We are not having lunch.
He is not reading a book.
The dog is not running after a cat.
The boys are swimming across the river.
★特殊疑問(wèn)句：what, which, how, where, who, etc.
疑問(wèn)詞＋動(dòng)詞＋主語(yǔ)＋現(xiàn)在分詞
What are you doing?
What is she doing?
What is the dog doing?
(必背)

沒(méi)有進(jìn)行時(shí)的動(dòng)詞
表示狀態(tài)，思想，感情和感覺(jué)的動(dòng)詞不能表示正在進(jìn)行的動(dòng)作
1. 表示感覺(jué)，感官的詞
see, hear, like, love, want,
2. have, has當(dāng)”擁有”講時(shí)沒(méi)有進(jìn)行時(shí)
3. 一般過(guò)去時(shí)
表示過(guò)去發(fā)生的動(dòng)作或事件， 常和表示過(guò)去的時(shí)間狀語(yǔ)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^(guò)去式，am, is的過(guò)去式為was，are的過(guò)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(wèn)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?