They enjoy cleaning the teacher's desk and windows.
他们享受打扫教师课桌和窗户。
The Windows are dirty. They need cleaning.
窗户脏了，它们需要清洗。
Are they cleaning the Windows? Yes, they are.
他们正在擦窗户吗？是的，他们在。
He had the boy cleaning the Windows.
他让那个男孩正在擦窗户。
Your task is cleaning the Windows.
你的任务就是擦窗户。
I don't think the Windows need cleaning at this time of the night.
我看不必在夜里这个时侯擦窗子吧。
This (being) done, I set about cleaning the windows.
做完此事，我就开始（begin）擦洗窗户。
This (being) done, I set about cleaning the windows.
做完此事，我就开始（begin）擦洗窗户。
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