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is后面加动词什么形式

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瑞文问答

2021-09-09

is后面的动词一定要用ing,但是也要具体情况具体分析的,当为be+to do 为将要做某事,或是祈使句。例如:What youve got to do is turn around and say :" Watch me"。为一句祈使句。

扩展资料

  系动词Be(am, is, are)的用法

  基本形式:am、are、is

  1、am

  第一人称I+am (注意:“I”无论何时都要大写,不管位于句首还是句中).

  例:I am a beautiful girl. I am twenty.

  I am 还可缩写成I'm。 如:I'm David. 我是大卫。

  但是am与not不能缩写。

  2、are

  第二人称you+are; 一人称复数we+are; 三人称复数they+are 其他复数名词+are。

  (注意:第二人称单复数同形,都为you)

  例:You are my good friend. We are in the same class.

  They are on the road. The books are on the desk.

  are与主语还可缩写。如:

  We are= We're, They are =They're, You are = You're。而are与 not可缩写成aren't。

  3、is

  第三人称he(男) +is ; she(女)+is; it(不是人)+is;其他单数名词+is。

  例:HeShe is a good student. It is a white cat. A dog is on that street.

  is也可与主语缩写,如:

  He is = He's, My mother is = My mother's等。但是This is不可缩写。而is与not可缩写成 isn't。

  如:This isn't a book. 这不是一本书。