什么是be动词?be动词怎么用?do\does的用法!什么时候用do,什么时候用does．Tom --(have\has) an eraser.___they have a TV?——Tom ___ a book?____Mary and Tom ____ a pencil?快!快!快!快!快!快!

什么是be动词?be动词怎么用?do\does的用法!什么时候用do,什么时候用does．Tom --(have\has) an eraser.___they have a TV?——Tom ___ a book?____Mary and Tom ____ a pencil?快!快!快!快!快!快!
什么是be动词?be动词怎么用?do\does的用法!什么时候用do,什么时候用does．
Tom --(have\has) an eraser.
___they have a TV?
——Tom ___ a book?
____Mary and Tom ____ a pencil?
快!快!快!快!快!快!

什么是be动词?be动词怎么用?do\does的用法!什么时候用do,什么时候用does．Tom --(have\has) an eraser.___they have a TV?——Tom ___ a book?____Mary and Tom ____ a pencil?快!快!快!快!快!快!
be动词的用法
be
[bi:]
vi
现在时 I am,you are,he is,we are,you are,they are （缩略式 I'm,you're,he's,we're,you're,they're）,（否定缩略式 I'm not,isn't,aren't）,过去时 I was,you were,he was,we were,you were,they were （过去时否定缩略式 wasn't,weren't）,过去分词 been,现在分词 being
英语的“be”是个特别动词；有些语言,如中文和马来文,并没有“be”这样的动词.
“Be”除了原形的“be”之外,还有另外七种形式：am,is,are,been,being,was,were.
在句子中,“be”可以是主动词(The Principal Verb)或助动词(The Auxiliary Verb).
【当主动词时,“be”在性质上属于接系动词(The Linking Verb),后面要有名词、形容词、地方副词或短语作补足语(The Complement).例如：
1.The man is a science teacher.
2.Mary's new dresses are colourful.
3.I have been there before.
4.Mother is in the kitchen now.
【这四个都是陈述句,可以变成疑问句,方法简单,把主语和“be”或助动词对换位置即可：
5.Is the man a science teacher?
6.Are Mary's new dresses colourful?
7.Have I been there before?
8.Is mother in the kitchen now?
【当“be”要在祈使句中出现时,它必须借重助动词“do”或“don't”之助,如：
9.Don't be silly!
10.Do be obedient!
11.Don't be a fool!
【“Be”有两种缩写法,如下：
12.He's not./He isn't.
13.You're not./You aren't...
【但“am + not”的缩写法只有一个：
14.I'm not.
有人用“ain't”,但这并不是标准英语.
谈过了“be”作主动词的功能,现在看看“be”作助动词时,有些什么用法：
【1.】“Be + 现在分词”以组成进行式时态(Continuous Tenses),如：
15.Tony's maid is washing his new car.
16.The children are playing in the field.
17.Samuel was eating when I came in.
18.We have been living here since 1959.
【2.】“Be + 过去分词”以组成被动语态(The Passive Voice),如：
19.Her money in the drawer was stolen.
20.A number of good jobs are taken up byforeigners.
21.David studied in Taiwan but has been trained as a language lecturer in America.
22.Can all the wonderful birds be found in our Bird Park?
23.The disobedient boy was told to stand out- side the classroom.
24.Steps are being taken to reduce traffic con- gestion during peak hours.
25.Dishonest students will be immediately dealt with.
do 这个词（does是第三人称单数形式）,大体上从两方面来讲.
1.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.
2.作为助动词,也就是帮助主要动词构成否定和疑问等.
We don't like bananas.
Do you like apples?
Does he like English?
He doesn't like swimming.
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,而原来的主动词does变成原形do了.
Tom has(have\has) an eraser.
_Do__they have a TV?
问题补充：——Tom _has__ a book?
__DO__Mary and Tom __have__ a pencil?