3、系动词Be(am, is, are)的用法
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系动词Be(am, is, are)的用法
一、am,is are 都属于be动词,be是他们的原型
be动词的一般现在时有三种形式,即:am, is, are。
1、基本形式:am、are、is
(1)、am
第一人称I+am (注意:“I”无论何时都要大写,不管位于句首还是句中)
例:I am a beautiful girl. I am twenty.
I am 还可缩写成I'm。如: I'm David. 我是大卫。
但是am与not不能缩写。
(2)、are
第二人称you+are; 一人称复数we+are;三人称复数they+are 其他复数名词+are
(注意:第二人称单复数同形,都为you)
例:You are my good friend. We are in the same class.
They are on the road. The books are on the desk.
are与主语还可缩写。如:
We are= We're, They are =They're, You are = You're。而are与 not可缩写成aren't。
(3)、is
第三人称he(男) +is ; she(女)+is; it(不是人)+is;其他单数名词+is
例:He\She is a good student. It is a white cat. A dog is on that street.
is也可与主语缩写,如:
He is = He's, My mother is = My mother's等。但是This is不可缩写。而is与not可缩写成 isn't。
如:This isn't a book. 这不是一本书。
二、请记住以下口诀:
我用am,你用are,is连着他,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Am,Is,Are大写莫迟疑,,句末问号莫忘加
三、注:
复数主语全用are。
指示代词作主语,This、that用is,These、those要用are。
回答一般疑问句,Yes,或No简回
will/can/could/would/should/shall 等助动词后面加be
其他时候,
第一人称I后面用am 第二人称, 复数, 用are 单数用is...
四、由连系动词am,is,are构成的句子:变一般疑问句时把am,is,are提到句子的前面,句尾用问号即可。变否
定句时直接在am,is,are后面加not即可。例如:
肯定句:He is a student. 一般疑问句: Is he a student?
否定句: He is not a student.
画线提问:
对he提问: Who is a student? 对 a student 提问: What is he?
另:特殊疑问句中:where\how\who\what\why+be动词+人称代词或名词?
例:What is your name? My name is GaoBuHan.
Where are you? I’m in the classroom.
五、Be动词在一般过去时中的变化:
be动词的一般现在时有两种种形式,即:was,were。
1.am 和is在一般过去时中变为was。(was not = wasn’t)
2.are在一般过去时中变为were。(were not = weren’t)
3.带有was或were的句子,其否定、疑问的变化和am,is, are一样,
即否定句在was或were后加not,一般疑问句把was或were调到句首
一、练习:用恰当的be动词填空。
1)I _____ a student. 2) You ____ a teacher.
3)____she from Jinan? No, she ____. 4) _____you friends? No, we ____.
5) He _____ in Class 4, Grade 1. 6) It_____ a car.
7) They ____ cars. 8) ____ your mother in China?
9) _____your friends in New York? 10) What ____her name?
11) These _____ buses. 12) Those _____oranges.
13) Where _____ her mother? 14) How old _____your teacher?
15) What class _____ you in? 16)This ____ my brother.
17)That ____ a pencil. 18)Mike and I____ students.
19)____ there an apple on the table? Yes, there ____. 20)There____many books in the study.
21)There____some ice cream in the fridge. 22)There____a pear and some cakes on the table.
23)The children___ playing in the bedroom. 24)The rabbits___ eating grass.
25)What___ your favorite subject? 26)The girl___ drawing. 27) "I"___ a letter(字母.) 28.The socks ______ on the desk.
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