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肯定式：am/is/are+doing(现在分词)

否定式：am/is/are not +doing(现在分词)

一般疑问式：Am/Is/Are + 主语 +doing(现在分词)+ 其他

特殊疑问式：特殊疑问词+一般疑问式

They’re having a meeting now.

他们现在正在开会。

They aren't having a meeting now.

他们现在没有在开会。

Are they having a meeting now?

他们现在正在开会吗?

What are they doing now?

他们现在正在做什么?