They are cleaning the classroom.
他们正在打扫教室呢。
By the time the teacher came, we had finished cleaning the classroom.
老师来的时候，我们已经打扫完教室了。
We are both cleaning the classroom.
我们俩人都在打扫教室。
We are cleaning the classroom now.
我们现在正在打扫教室。
I suggest cleaning the classroom now.
我建议现在就打扫教室。
He did a beautiful job of cleaning the classroom.
他打扫了教室，活儿干得很漂亮。
We were cleaning the classroom when they came in.
他们进来的时候我们在打扫教室。
We found the key while we were cleaning the classroom.
我们在打扫教室时发现了这把钥匙。
He thanks them for cleaning the classroom for him.
他感谢他们为他打扫教室。
You have been cleaning the classroom, I think.
我想你刚才在打扫教室吧。
Some students are cleaning the classroom; others are playing on the playground.
一些学生在打扫教室，另一些在操场上玩。
Our classroom needs cleaning now.
我们的教室现在需要打扫了。
The classroom requires cleaning right now.
教室需要马上打扫卫生。
The boy finished cleaning the classroom and went home.
这个男孩打扫完教室后就回家了。
They are both busy cleaning the classroom.
他俩正在忙于打扫教室。
The party will begin in an hour. The children are busy cleaning the classroom.
聚会一小时以后开始，孩子们正忙着打扫教室。
The classroom needs cleaning every day.
教室需要每天打扫。
While we were cleaning up the classroom, the staff were having a meeting.
当我们正在打扫教室时，职员们正在开会。
He wants to finish cleaning the classroom before one o 'clock.
他想一点之前打扫完教室。
Look! A little boy is cleaning the classroom.
看，一个小男孩正在打扫教室。
Look! Theyare cleaning the classroom.
看！他们正在打扫教室呢。
Weare cleaning the classroom now.
我们现在正在打扫教室。
They can't be cleaning the classroom now.
他们现在不可能在打扫房间。
The teacher left the classroom, leaving me in charge of the cleaning task.
老师离开了教室，留下我负责打扫任务。
They aren't cleaning the classroom.
他们没在打扫教室。
It is they who have finished cleaning the classroom.
打扫完教室的人是他们。
It is they who have finished cleaning the classroom.
打扫完教室的人是他们。
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