她正在做作业，但她觉得困了。

She's doing her homework, but she feels sleepy.

我正在做作业。

I am doing my homework.

迈克正在做作业。

Mike is doing his homework.

当消息传来时，她正在做作业。

She does her homework. The news comes.

林涛正在做作业。

Lin Tao is doing his homework.

我到家时，我看见玛丽正在做作业。

When I got home, I saw Mary doing her homework.

爷爷正在写信。 弟弟正在做作业。 我在打扫房间。

Grandpa is writing a letter. Brother is doing homework. I am cleaning the room.

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.