be动词用法

be动词用法

be动词的一般现在时有三种形式，即：am, is, are。

1. 如果主语是第一人称I（我）时，be动词用am。

如：I am a student. 我是一名学生。

I am 还可缩写成I'm。如：I'm David. 我是大卫。

2. 如果主语是you （你，你们）, they （他们，它们，她们）或名词复数（两个以上的人或物）时，be动词必须用are。如：Are you twelve 你是十二岁吗

Tom and Lily are good friends. 汤姆和莉莉是好朋友。

They are at school.他们在学校。

These are books. 这些是书。

We are students . 我们是学生。

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。

如：They aren't students. 他们不是学生。

但是am与not不能缩写。

3. 如果主语是单数名词、不可数名词或单数第三人称代词（he, she, it）时，be动词用is.如:My mother is a teacher. 我的妈妈是一名老师。

He is a student. 他是一名学生。

She is my friend.她是我的朋友。

It is a dog. 它是一只狗。

This is a bike .这是一辆自行车。

That is a cup . 那是一个杯子。

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。

[解题过程]

根据以上叙述我们可以把动词的用法以口诀的形式表

述出来：

我（I）是am,

你（you）是are,

剩下is留给她（she）, 他（he）, 它（it）,两个以上都用are。

be动词用法歌

be动词真伟大，生出is, am, are。

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。

1 用动词be （am，are，is）填空

I _____ a student.

Lucy and Lily ____ from USA.

---Who ___ they

--- They ____ Jim, Mike and John.

The white shirts _____ on the chair.

Their bikes ____ under a big tree.

His father ___ at home.

How old _____ you

______ there any birds in the tree

2 选择填空

---What class ___ you in --- I_____ in Class One.

A are;are

B are;am

C are; is

They ____ new students. We ____ not new.

A are ; are

B are; am

C are ; is

---Where ____ his pencils --- Oh, in his bag.

A is

B are

C am

Miss Gao _____ our teacher. She ____ tall.

A are; are

B are; is

C is; is

Their classroom ______ over there.

A are

B is

C am

I think Ann and Betty _____ in the classroom.

A is

B am

C are

Be动词的用法及介绍

“Be”动词的意思是”是”,它随人称的变化而变化.

动词属于系动词, 在句子中主要表现为三种形式：am is、are。后面往往接形容词或名词做表语。如：

(1)I’m young. (young形容词做表语)

(2)He is a boy.( a boy名词做表语)

含有be动词的句子在进行否定、疑问句变化时，都要在be动词上变化。

(1)变为否定句：主语+be+ not+其他。即，直接在be后not.

①I’m a Chinese boy.(变为否定句)

②You are good. (变为否定句)

③He is strict with us. (变为否定句)

④She is from America. (变为否定句)

以上四个句子中都含有am、is或are，变否定句时，直接在am 、is、are后面加上not.即：

①I’m not a Chinese boy.

②You are not good.

③He is not strict with us.

④She is not from America.

(2)变为一般疑问句：Be+主语+其他即把be动词提到主语的前面。注意：当肯定句主语为第一人称I和We时，变一般疑问句要变为第二人称，be动词也要相应的变为are.同样肯定句中的my和our 也要变为your.

①I am a boy. (变为一般疑问句)

→Are you a student

②We are good friends. (变为一般疑问句)

→Are you good friends

③She is from America. (变为一般疑问句)

→Is she from America

④He is strict with us. (变为一般疑问句)