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
