问题描述：
单复数句型转换
It is a bag.
Is that an eraser?
What's this in English?
He isn't my friend.
Are these their photos?
He has a round face.
Do the boys have apples?
She has a knife.
It is a bag.
Is that an eraser?
What's this in English?
He isn't my friend.
Are these their photos?
He has a round face.
Do the boys have apples?
She has a knife.
问题解答：
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