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定义：经常反复发生的动作或存在的状态

be动词用am/is/are

实意动词用原形或单三形式

句型变化

(1)一般疑问句：将am/is/are提前，I变you,my变your,I am变Are

you,句号变问号。

(2)否定句;在am/is/are后加not

She is a student.

Is she a student?

She isn't a student.

当主语不是单三时，谓语动词用原型

句型变化

(1)一般疑问句：在句首加助动词do,I变you,my变your,句号变问号。

(2)否定句;在主语和谓语之间加助动词don't

I like blue.

Do you like blue?

I don't like blue.

当主语是单三时，谓语动词用单三形式

句型变化

(1)一般疑问句;在句首加助动词does,my变your,动词还原,句号变问号

(2)否定句;在主语和谓语动词之间加助动词doesn't,动词还原

She likes blue.

Does she like blue?

She doesn't like blue.

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