Помогите пожалуйста. Write questions for the sentences. Answer with the short answer.

The ruler is on the desk.(+)
The pencils are next to the pencil sharpener.(-)
We are in the classroom. (+)
I am eighteen years old.(-)
You are my friend.(+)
He is from China.(-)
She is English.(+)
They are on the bus.(-)

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.

Что значит " Answer with the short answer "
Is the ruler on the desk?- Yes,it is
Are the pencils next to the pencil sharpener? - No,it isn't
Are we in the classroom?-Yes , we are
Am I eighteen years old?- No , I am not
Are you my friend?- Yes ,I am
Is he from China? - No , he is not
Is she English? - Yes ,she is
Are they on the bus? - No , they are not