现在进行时的四种句型结构

1、肯定式结构:主语+be+动词-ing形式+其他.

例如:We are running now.

2、否定式结构:主语+be+not+动词-ing形式+其他.

例如:They aren’t doing their homework.

3、一般疑问句式结构:Be+主语+动词-ing形式+其他?

例如:Is she having English lesson?回答:肯定Yes, she is. 否定:No, she isn’t.

4、特殊疑问句式结构:疑问词+be+主语+其他?

例如:What is he doing now?回答:He is swimming.