新概念英语第一册语法复习：现在进行时

表示现在正在进行的动作。

构成：主语+be动词+动词的现在分词+其它成分（现在分词的构成见附录）

We are having lunch。

He is reading a book。

The dog is running after a cat。

The boys are swimming across the river。

★变疑问句将be动词移到句首

Are we having lunch？

Is he reading a book？

Is the dog running after a cat？

Are the boys swimming across the river？

★变否定句在be动词后面加not

We are not having lunch。

He is not reading a book。

The dog is not running after a cat。

The boys are swimming across the river。

★特殊疑问句：what， which， how， where， who， etc。

疑问词+动词+主语+现在分词

What are you doing？

What is she doing？

What is the dog doing？

没有进行时的动词（必背）

表示状态，思想，感情和感觉的动词不能表示正在进行的动作

1、表示感觉，感官的词

see， hear， like， love， want，

2、have， has当”拥有”讲时没有进