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. 再问： Is there a computer on the teacher's desk回答 再答： 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。 再问： Are there three people in your family回答呢 再答： 肯定回答：Yes, there are. 否定回答：No, there aren't.
