问题描述：
Is cindy playing volleyball with her friends?yes,they are.
为什么问的时候用is,回答的时候是are,而不是“yes,she is.
Are cindy and her friends playing volleyball 可以么?
为什么问的时候用is,回答的时候是are,而不是“yes,she is.
Are cindy and her friends playing volleyball 可以么?
问题解答：
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