Is there a maths book in your desk?
肯定回答：Yes,there is.
否定回答：No,there isn't.
句意：你桌子里有一本数学书吗?是的,有.\ 不,没有.Is there a computer on the teacher's desk回答回答一样的。肯定回答：Yes, there is.否定回答：No, there isn't.如果是问复数的，就把is改为are，isn't改为aren't。Are there three people in your family回答呢肯定回答：Yes, there are.否定回答：No, there aren't.