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

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 not 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, want2. have, has当“拥有”讲时没有进行时