If you write on the blackboard, rub it off at the end of the lesson.
如果你在黑板上写字，下课时要擦掉。
Who wrote those rude-words on the blackboard? Rub them off please!
是谁在黑板上写的那些粗话？请擦掉！
Rub those words off the blackboard before the teacher sees them.
在老师看见之前，把黑板上的那些字擦掉。
Rub those words off the blackboard before the teacher sees them.
在老师看见之前，把黑板上的那些字擦掉。
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