解放军文职考试英语辅导：is后面加动词

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 you've got to do is turn around and say :" Watch me"。为一句祈使句。

系动词Be(am, is, are)的用法

1．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。