您要查找的是不是：
- He didn't clean the room yesterday. 他昨天没打扫房间。
- Did he clean the room yesterday? 他昨天打扫房间吗？
- Are we under any obligation to clean the room? 我们有义务打扫这个房间吗?
- Is there anything I can do to clean the room? 打扫房间我能不能干点什么?
- I hate to be obliged to clean the room. 我讨厌被逼着去打扫房间。
- That is very kind of you to help me clean the room. 您真好，帮助我打扫房间。
- We use brooms to clean the room. 我们用苕子打扫房间。
- He assisted me to clean the room. 他协助我收拾房间。
- Could you clean the room while I am out for lunch? 你能在我出去吃午饭的时候打扫房间吗?
- You should clean the room by yourself. 你应该自己打扫房间。
- She volunteered to clean the room. 她主动打扫房间。
- He instructed us to clean the room. 他命令我们清扫房间。
- Mary not only cleaned the room but (also) washed the window. 玛丽不但清扫房间而且也洗刷窗子。
- Let me help you(to) clean the room. 我来帮你打扫房间。
- I put it on her pillow, and then we clean the room. 我把它放在她的枕头，然后我们打扫房间。
- Can you clean the room all alone? 你能独自把房间打扫干净吗？
- He is cleaning the room when he finds a watch in the corner. 当他正在打扫房间的时候，他在角落里发现了一块手表。
- You must clean the room thoroughly. 你必须彻底打扫房间。
- On my insistence, he cleaned the room. 经我坚持, 他才打扫了房间。
- He did not clean the room yesterday. 他昨天没打扫房间。
