Is cindy playing volleyball with her friends?yes,they are.

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?

问句的主语是cindy……可是老师说用“yes,they are。”这是为什么?Are cindy and her friends playing volleyball ?这句话又是病句么?其实我觉得回答应该是yes,she is.