把它写在黑板上。
Come and write it on the blackboard.
过来写在黑板上。
Write it on the blackboard/in your exercise book/workbook/ a piece of paper .
把它写在黑板上/你们的练习本上/活动用书/一张纸上。
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。
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。
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