1Is the ruler on the desk?-Yes, it is.
2Are the pencils next to the pencil sharpener?-No, they aren't.
3Are we in the classroom?-Yes, we are.
4Am I eighteen years old?-No, I am not.
5Are you my friend?-Yes, you are.
6Is he from China?-No, he isn't.
7Is she English?-Yes, she is.
8Are they on the bus?-No, they aren't.