The classrooms are big.
否定句：the classrooms are not big.
一般疑问句：are the classrooms big?
肯定回答：yes,they are
否定回答：no,they aren't.
Our Chinese teacher is tall
否定句：our chinese teacher isn't tall
一般疑问句：is our chinese teacher tall?
肯定回答：yes,he is.
否定回答：no,he isn't.