问题描述：
she is a teacher.变复数 it is a pen.变复数 this is my
she is a teacher.变复数
it is a pen.变复数
this is my friend.变复数的一般疑问句,并做肯定及否定回答
she is a teacher.变复数
it is a pen.变复数
this is my friend.变复数的一般疑问句,并做肯定及否定回答
问题解答：
我来补答
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