（1）be 动词

be 动词包括am, is, are. am适用于主语是I 的情形,is适用于主语是第三人称单数的情况,其他情况都用are.

She is a doctor. (接名词)

She is very pretty. (接形容词)

He was here yesterday. (接副词)

His mother is at home. (接介词短语)

Your duty is to work hard. (接动词不定式)

His job is feeding the cow at the farm. (接动名词)

（2）感官动词

感官动词主要有look, sound, smell, taste, feel, touch等,这类动词后不能像be 动词那样接任何成分,只能接形容词做表语.注意感官动词无被动语态.

Your father looks young. 你的爸爸看起来很年轻.

His plan sounds good. 他的计划听上去很好.

The flower smells nice. 这花闻起来很香.

The soup tastes delicious. 这个汤尝起来很好喝.

Silk touches soft. 丝绸摸起来很柔软.

系动词之感官动词无被动

(3) 表示变化过程的系动词

这类动词有become, get, grow, turn等.

He became interested in math. 他变得对数学感兴趣.

I got very angry. 我变得很生气.

It was growing dark. 外面开始渐渐变黑.

Mr. black’s face turned red. 布莱克先生的脸变红了.

(4) 表示状态的系动词

这类动词有keep, stay, remain 等.

The shop stays open till 8 p.m. 这家商店一直营业到晚上8点.

He still remained weak. 他仍然很虚弱.

系动词用法