找出三个英语句子然后变成肯定句和否定句和单数句

找出三个英语句子然后变成肯定句和否定句和单数句

They are books.
They are not books.
It is a book.
We are students.
We are not students.
I am a student.
You are teachers.
You are not teachers.
You are a teacher.
亲:祝你学习进步,每天都开心V_V!
望采纳,thx!
Mr Gao
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