把下列句子改成否定句.

题目

把下列句子改成否定句.
This ia my brother.
It is his book.
He is sad.
He has a bag.
They like red.
Mary and Amy are sisters.
I have breakfast every morning.
Mary likes math.
That is my brother.
I am happy.
She has two sisters.
His favorite teacher is Miss Li.
Tom gets up at seven.
They go to school everyday.
They are families.
Mr Smith is my art teacher.

答案

This isn't my brother.
It isn't his book.
He isn't sad.
He doesn't hasvea bag.
They don't like red.
Neither Mary nor Amy are sisters.
I don't have breakfast every morning.
Mary doesln't ikesmath.
That isn't my brother.
I am not happy.
She doesn't have two sisters.
His favorite teacher isn't Miss Li.
Tom doesn't get up at seven.
They don't go to school everyday.
They aren't families.
Mr Smith isn't my art teacher.