The crassrooms are big.
否定句:The classrooms aren't 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 your Chinese teacher tall
肯定回答:Yes,she is.
否定回答:No,she isn't.
I am eleven years old.
否定句:I am not eleven years old.
一般疑问句:Are you eleven years old
肯定回答:Yes,I am.
否定回答:No,I'm not.