The fourth step: reduction of hand exercises.
第四步：还原手发练习。
You have to hand in your exercises.
你必须把练习题交上来。
You must hand in your exercises this afternoon.
今天下午你们必须交上作业。
The teacher desired that all the exercises (should) _be_handed (hand) in before school was over.
老师要求所有练习放学前交上来。
The teacher urged us to hand in our exercises.
老师催促我们交作业。
Could you tell me when we should hand in our exercises?
你能告诉我什么时候我们交练习题？
If you have done your exercises, please hand them in.
如果你们练习做完了请交来。
You are to hand in the exercises tomorrow.
你们明天必须交练习。
Must we hand in our exercises today ?
我们今天必须交作业吗？
Hand in your exercises please.
请把作业交上来。
Must we hand in our exercises today?
我们必须今天交作业吗？
Must we hand in our exercises today?
我们必须今天交作业吗？
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