Looking at the blackboard 追问: Don't run , Tom. 改为现在进行时。 追问: Don't talk in class. 改为现在进行时。 回答: Aren't running , Tom 补充: Don't talk in class. 改为现在进行时。-------Aren't talking in class (因为是祈使句,省略主语you。所以用aren't)请采纳谢谢记得采纳啊