他正在干什么？他正在看电视。

What is he doing? He is watching TV.

youdao

他正在干什么？他正在写信。

What is he doing? He is writing a letter.

youdao

我不知道他正在干什么？

I don't know what he is doing now.

youdao

昨晚九点他正在干什么？

What was he doing at 9 last Sunday?

youdao

他会心不在焉起来，忘了自己刚才正在干什么。

His mind would wander, and he would lose track of what he was doing.

《柯林斯英汉双解大词典》

你弟弟正在干什么？他正在做家庭作业。

What's your brother doing? He's doing his homework.

youdao

你父亲在干什么？他正在看电视。

What is your father doing? He is watching TV.

youdao

他以为她正在干什么？

What do he think she is doing?

youdao

他以为她正在干什么？

What does he think she is doing?

youdao

他正在思考毕业后干什么。

He is contemplating what he should do after graduation.

youdao

他(她)正在干什么？

What is he (she) doing?

youdao

他正在家干什么呢？

What is he doing at home?

youdao

他正在家干什么呢？

What is he doing at home?

youdao