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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You can’t make faces in class.(变祈使句）
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?

望采纳，谢谢！