Is she your cousin? (-)
No, she isn't.
Are you good at English? (+)
Yes, I am.
Are those your books? (+)
Yes, they are.
Is this your desk? (-)
No, it isn't.
Is this present for me? (+)
Yes, it is.
Is this class 4B? (+)
Yes, it is.
Are we classmates? (+)
Yes, we are.
Is he your brother? (-)
No, he isn't.
Are we happy? (+)
Yes, we are.
Are they cool? (+)
Yes, they are.
Are you from China? (-)
No, I'm not.