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简介：
一、现在进行时专项
1、改写句子
They are playing football. (改为一般疑问句)
答案：Are they playing football?
解析：现在进行时疑问句结构为 Be动词+主语+doing？，首字母大写。
2、填空
Look! The cat ______ (run) up the tree.
答案：is running
解析：Look!提示动作正在进行，主语The cat为第三人称单数，be动词用is。
3、情景对话
A: "What are you doing?"
B: "I ______ (write) an email to my friend."
答案：am writing
解析：现在进行时结构为 主语+be动词(am/is/are)+doing，I对应am。
4、否定句转换
She is singing in the room. (改为否定句)
答案：She is not sing
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