我从来不必在房客们走后做打扫。要做的话，他们做大部分的清扫。
I never had to clean up after the lodgers. If anything, they did most of the cleaning.
假如他不喜欢铲雪，那就给他一个相应的选择：他可以打扫车库，或真空清扫房间。
For example, if he hates shoveling snow, give him the option to substitute another chore, such as sweeping out the garage or vacuuming the house.
我们的教室每天都打扫，但昨天没扫，明天由第一组清扫。
Our classroom is cleaned every day, but it wasn't cleaned yesterday.
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