英语：他在做什么?用英语怎么说

What is he doing? I 是第一人称用am.you 是第二人称用are. he/ she/ it都是第三人称,全都用is.
所以是:
What am I doing?
What are you doing?
What is he/she/it doing?

另外所有的非人类的动物,物品之类的也都用is.
但是如果第三人称是非复数,比如他们,她们,或一群动物,就要用are.
所以是：
What are they doing?
What are those boys doing?
What are these dogs doing?