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表示请求做某事。
What are you doing?
We are practicing for the talent show.
The tense
现在进行时：表示说话时存在的状态或
进行的动作。
句型：主语+Be动词+动词的ing形
式+其他
What is he doing?
He is .
What is she doing?
She is .
without a + 名词 ,you can’t +动词
Without our nose ,we can’t smell.
Without our feet ,we can’t walk.
Without( ), we can’t( )
Qiaoqiao: Can I come in?
Xiaoxiao: Yes, you can.
Qiaoqiao: What are you doing?
Jim: We are practicing for the talent show.
Qiaoqiao: Talent show? Can I join you?
Xiaoxiao: I’m sorry. You ‘re too young.
Qiaoqiao: I’m a good pianist. Without a pianist, you can’t make a good band.
Can I join you?