少儿英语语法顺口溜：be动词的用法be 的用法口诀 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，句首大写莫迟疑。
be动词的用法：be (be/is/are/am/was/were) vi 遥时 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, 遥分词being 英语的“be”是个特殊动词;有些语言，如马来文等，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) 例句对照 【当主动词时，“be”在遥质上属于接系动词(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.
这个男子是一位科学教师 2.
Mary's new dresses are colourful.
玛丽的新衣服遥彩鲜艳 3.
I have been there before.
我以前去过那里 4.
My mother is watching TV in the room.
母亲遥在客厅看电视 【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，遥看看“be”作助动词时，有些什么用法： 【1.
】“Be + 遥分词”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.
】“情态动词+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.