They are my parents.如何改写成单数句子？

这是初一英语中关于单复数的练习

有两个答案：
He is my father

或者

She is my mother

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英语里 my parents是复数形式，后面要跟are. my parents are both teachers.

She is my mother. He is my father.

I am their son。

成：This is my father.这是我的爸爸。 或者：This is my mother