我妈妈进来的时候我正在打扫房间。

I was cleaning the room when my mother came in.

youdao

现在我正在打扫房间。

I am cleaning my room now.

youdao

我正在打扫房间。

I'm cleaning the room.

youdao

我正在打扫我的房间。

I'm cleaning my room.

youdao

我母亲正在打扫房间。

The room is being cleaned by my mother.

youdao

我发现他正在打扫房间。

I found him cleaning the room.

youdao

当我回家时，看到妈妈正在打扫房间，我很抱歉。

When I go home, I see my mother is cleaning the house, I am so sorry to her.

youdao

昨天我看见他正在打扫房间。

I saw him cleaning the room yesterday.

youdao

昨天我看见他正在打扫房间。

I saw him cleaning the room yesterday.

youdao