He is writing a letter in the room.
She can swim in the river.
l and him am good friends.
Her father is playing the piano.
There are three windows in the wall.
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Mike has lunch at school.(变一般疑问句）
He wrote a letter yesterday.(变一般疑问句）
There are fifteen book on the floor.(就fifteen提问）don't make face in class.
does mike have lunch at school?
he didn't write a letter yesterday.
how many books are there on the floor?
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