英语中系动词是什么

系动词亦称联系动词，作为系动词，它本身有词义，但不能单独用作谓语，后边必须跟表语（亦称补语），构成系表结构说明主语的状况、性质、特征等情况。
连系动词分为三类：be
动词，感官动词，趋势动词。
1)
Be
动词：am,
is,
are,
was,
were
we
are
dancing
He
was
afraid
to
go
out
last
night.
He
is
a
teacher.
2)
感官动词：sound,
look,
taste,
feel,
smell
This
kind
of
cloth
feels
very
soft.　
This
flower
smells
very
sweet.　
He
looks
tired
These
oranges
taste
nice
3)
趋势动词：appear,
become,
grow,
get,
turn,
seem,
remain
He
became
mad
after
that.
He
seems
(to
be)
very
sad.

基本上有三个方面内容。一个就是be和其变形，如：am，is，are，was，were，been，being，第二类可以称为感官性系动词，如feel，taste，look，seem，sound。第三类可以称为变化性系动词，如：become，grow，get，turn。

1）状态系动词
用来表示主语状态，只有be一词
）持续系动词
用来表示主语继续或保持一种状况或态度，主要有keep,
rest,
remain,
stay,
lie,
stand
3）表像系动词
用来表示"看起来像"这一概念，主要有seem,
appear,
look
4）感官系动词
感官系动词主要有feel,
smell,
sound,
taste
5）变化系动词
这些系动词表示主语变成什么样，变化系动词主要有become,
grow,
turn,
fall,
get,
go,
come,
run
6）终止系动词
表示主语已终止动作，主要有prove,
trun
out,
表达"证实"，"变成"之意