Must we clean the classroom at once?
我们必须马上打扫教室吗？
我们必须要打扫教室吗？
Must we clean the classroom right now?
我们必须现在打扫教室。
We must keep the classroom clean.
我们应该保持教室干净。
Besides, we cannot eat in the classroom and must clean the room everyday.
在教室里也不能吃东西，更要每天打扫教室。
We must keep the classroom clean and tidy.
我们必须保持教室干净整洁。
Keep quiet! The baby is sleeping. We must keep our classroom clean.
那婴儿正在睡觉，保持安静！我们必须保持我们的教室干净。
At school, we must clean the classroom.
在学校，我们必须打扫教室。
At school, we must clean the classroom.
在学校，我们必须打扫教室。
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