基本句型Ｓ+ Ｖ系+ Ｐ（主＋系＋表）句型中，有一个共同的特点：句子谓语动词都不能表达一个完整的意思，必须加上一个表明主语身份或状态的表语构成复合谓语，才能表达完整的意思。这类动词叫做连系动词。
可以做表语的成分有：名词，形容词，副词，动词不定式，动名词，过去分词，现在分词，表语从句．
系动词主要是起到连系主语和表语的作用。有以下几类：
1. 表“是” 如：be“是”(am, is, are, was, were)
2.表“感觉” 如：look看起来feel感到，sound听起来，smell闻起来，seem似乎
3. 表“变” 如：get变得, turn变得, grow变得，go变得, come变得, become成为
4. 表“保持” 如：keep保持, stay保持
I am a student.
My hobby is reading. 我的爱好是读书。
He became strong.
She remained there.
The story seemed interesting.（这个故事看起来很有趣。）
The window seemed broken.（窗口似乎打破了。）
His job is teaching English.（他的工作是教英语。）
Her plan is to become the winner in the game.（她的计划是成为游戏的赢家。
The question is whether he will come here in time tomorrow.（问题是他是否会在明天来这里的时候。）
The question is what he is going to do next.（问题是他接下来要做什么。）
The question is how he has managed to solve the problem by himself.（问题是他是如何设法自己解决问题。）
常用连系动词的用法：
①变成,变得：become, come, fall, get, go, grow, run, turn
口诀：好是come，坏是go; 天气、外貌慢慢grow; 流水、金钱缓缓run;
颜色、天气大不同turn；get / become口语化，如果要说就用它.
②保持某种状态：continue, keep, lie, remain, stand , stay.
③看起来，好像：appear, look, seem.
④感官动词：feel, smell, sound, taste.
注意：
1.There be 结构：
There be 表示‘存在有’。这里的there没有实际意义，不可与副词“there那里”混淆。此结构后跟名词，表示“（存在）有某事物”。
试比较：
There is a boy there.（那儿有一个男孩。）
前一个there无实义，后一个there为副词‘那里’。
2. 注意：
有一些动词既可以做连系动词又可以作及物动词和不及物动词。
He is growing very fast. ---不及物动词
I am growing apples in my backyard.---及物动词
The sea is growing rough.---连系动词
He is tasting the food.--- 及物动词
The food tastes good.--- 连系动词
3. 常见的be + adj. + with “主＋系＋表”搭配有：
be acquainted with与……相识
be angry with（sb.）对（某人）发怒
be busy with 忙于 be combined with与……结合
be content with 对……满意 be covered with 被……覆盖
be crowded with 充满 be familiar with 对……熟悉
be filled with 充满 be patient with 对……有耐心
be pleased with对……感到满意 be popular with 受……的欢迎
be satisfied with对……满意 be sick with 患……病
be strict with（sb.）对（某人）要求严格
be tired with 因……而感到疲劳
be concerned with 关心；涉及
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