Do (can)they help us? Yes, they do(can).
Has he got two dogs? Yes, he has.
Are they clever? Yes, they are.
Are the dogs at home? Yes, they are.
Is the dog at home? Yes, is it.
Can (does) the dog swim? Yes, it can (does).
Has she got a son? Yes, she has.
Is Jane at home? Yes, she is.
Is Jerry a pupil? Yes, he is.
Have you got a bike? Yes,I have.
Is it your bike? Yes, it is.