肯定句
I'm studying.
He is reading.
She is laughing.
否定句
I'm not sleeping.
He is not swimming.
We are not joking.
一般疑问句
Are you smiling?
Is he writing?
两个特殊文句
What are you doing?
Where is he heading to?= Where is he going?
如对于我的解答有问题,欢迎继续追问~
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