当我妈妈回来时，我正在做作业。

I was doing my homework when my mother came back.

youdao

今天早上琼打电话来的时候，我正在做作业。

I was doing my homework when Joan called this morning.

youdao

我正在做什么？我正在做作业。不，我没有。

What I am doing? You're writing. No, I'm not.

youdao

我正在做什么？我正在做作业。不，我没有。

What I am doing? You're writing. No, I'm not.

youdao