人教版七年级上册英语语法知识——助动词do和be动词的用法及区别(无答案）
助动词do与be动词的用法及区别
【知识精讲】
I．复习BE动词
1、be动词的用法。

be am / is are 现在时
was were 过去时
单数复数
英语中，be动词选用单数还是复数，要由主语来定，主语是单数，就用单数，
反之用复数。

◆句中含有be动词时：
肯定句：主语＋be ＋其他
否定句：主语＋be ＋not ＋其他
一般疑问句：Be ＋主语＋其他＋？
特殊疑问句：疑问词（what / who / when / where）＋be ＋主语＋其他＋？
I am a teacher. You are right.
She is 16 years old. My father is at home.
The students are playing games. My teacher was ill yesterday.
There is a picture on the wall.
There are two books on the table.
★ be动词用法歌：
我用am，你用are，is 连接他她它。

单数名词用is，复数名词全用are。

变疑问，往前提，句末问号莫丢弃；变否定，更容易，be后not莫忘记；
疑问否定任你变，句首大写莫迟疑。

★ be动词作谓语，它后面一般跟名词、形容词或介词短语。

II 助动词的用法。

1.助动词：帮助一个句子构成否定句、疑问句，不充当任何成分和任何意义。

2.初一年级的助动词一般是do/does.
3.英语句子按正常语序是“什么人或事物” + “做什么”，即，我们常说的“主语+
谓语+ 其他”。

但要进行句型转换时，句中谓语为行为动词，就要借助助动词do/does.
①主语为I 或复数名词、代词时：
肯定句：I / We / They / The students ＋动词原形＋其他＋。

We watch TV every night.
变否定：主语＋don’t ＋动词原形＋其他＋。

We don’t watch TV every night.
一般疑问句Do + 主语+ 动词原形+ 其他+ ？
Do you watch TV every night?
Yes, we do. / No, we don’t.
特殊疑问句：疑问词+ do + 主语+ 动词原形+ 其他+ ？
How often do you watch TV?
②主语为单数名词或代词时：
肯定句：主语+ 动词第三人称单数形式+ 其他+ 。

He watches TV every night.
否定句：主语+ doesn’t+动词原形+其他+。

He doesn’t watch TV every night.
一般疑问句：Does + 主语+ 动词原形+ 其他+ ？
Does he watch TV every night?
Yes, he does. / No, he doesn’t.
特殊疑问句：疑问词+ does + 主语+ 动词原形+ 其他+ ？
How often does he watch TV?
4.作为行为动词，跟其他动词一样，如study, play等。

他的意思是“做”等。

如：We usually do our homework in the afternoon. He does his homework in the evening.
在这两句话中的do/does“做”的意思，且充当谓语，因此是行为动词。

上面有一句He does his homework in the evening.要是变成否定句就成了这个样子：He doesn't do his homework in the evening.
这里加上了助动词doesn't，而原来的助动词does变成原形do了。

综合练习
一、用be动词适当的词填空。

1. I ________ from Australia.
2. She _______ a student.
3.Jane and Tom _________ my friends.
4. My parents _______ very busy every day.
5.I ______ an English teacher now.
6.Where _________ you from?
7.The light _________ green.
8.My name _________ Li Dong.I _________ twelve.
9._________ they your new friends?
10. I ______ a boy. ______ you a boy? No, I _____ not.
11. The girl______ Jack's sister.
12. The dog _______ tall and fat.
13. ______ your brother in the classroom?
14. Where _____ your mother? She ______ at home.
15. Whose dress ______ this?
16.That ______ my red skirt.
17. Some tea ______ in the glass.
18.Gao shan's shirt _______ over there.
19.Who ______ I?
20. My sister's name ______Nancy.
二、把下列动词变为第三人称单数形式。

1.live_____
2.like_____
3.do_____
4.wake_____
5.watch_____
6.play_____
7.have_____
8.eat_____
9.work_____ 10.fly_____ 11.speak____ 12.go____ 13.sing_____ 14.wash_____ 15.study_____
16.drive_____ 17.ride_____ 18.try_____
三、选择填空。

（）1 . I usually _____a cake on Saturday.
A.make
B.makes
C.making
（）2 . She _____ to play cars with her sister.
A.want
B.wanting
C.wants
（）3 . We _____ go home at 5:30 every day.
A.doesn’t
B.aren’t
C.don’t
（）4 . Mr. Wang doesn’t_____yellow.
A.like
B.likes
C.liked
（）5 . The pupils _____ very well.
A.don’t sing
B.aren’t sing
C.doesn’t sing
（）6 . Mike doesn’t _____ that.
A.does
B.do
C.\
（）7 . The boys _____their homework after school in the afternoon.
A.do
B.does
C.are
（）8 . My mother _____ TV in the afternoon.
A.watch
B.watchs
C.watches
（）9 . I _____ music very much.
A.am
B.like
C.am like
（）10.. They _____ have Maths every day.
A.\
B.does
C.are
（）11 . Xiaofang _____hard.
A.work
B.working
C.works
（）12.. She _____ with her mather and father.
A.is live
B.isn’t live
C.lives
（）13.. Tom and I _____ speak Chinese.
A.doesn’t
B.don’t
C.does
（）14.. Li Ping _____ him every day.
A.doesn’t see
B.see
C.don’t see。