摘要:-Is Nancy doing homework?-No, she isn’t. She’s writing a letter. -南希正在做作业吗?-不.她不是.她在写信. 用法:现在进行时态的肯定.否定和疑问句都是通过动词be 来实现的. Eg:(1)They their room.他们没在打扫房间. (2)- they/you to a policeman? No, they aren’t. --他们/你们正在与一个警察交谈吗?-不.没有.

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