Question

There is a house.改为否定句和一般疑问句

Answer 1

否定句：There isn't a house。

一般疑问句：Is there a  house。

以下是一般疑问句的相关介绍：

一般疑问句是疑问句的一种。它一般只用Yes…（是）或No…（否）来回答的句子。朗读一般疑问句时用疑问调，而一般疑问句的简略答语则用感叹调。

正如前面所述，回答一般疑问句时有肯定回答和否定回答两种方式，肯定回答以Yes起句，否定回答用No开头。但对一般疑问句的回答也不是一成不变的。肯定回答还可以用OK/Certainly等；否定回答可用Sorry等。

谓语动词是行为动词时，必须在句首加上助动词Do、Does（三单）、Did（过去式）加上这些助动词后，句子中谓语动词必须用原形。

以上资料参考百度百科——一般疑问句

Answer 2

（1）there is a bike under the tree.
否定句：There isn't a bike under the tree.
一般疑问句：Is there a bike under the tree
肯定,否定回答：Yes,there is./ No,there isn't.
（2）there are some apple trees in front of the house.
否定句：There aren't any apple trees in front of the house
一般疑问句：Are there any apple trees in front of the house
肯定,否定回答：Yes,there are./ No,there aren't.
（3）there was a football match yesterday afternoon.
否定句：there wasn't a football match yesterday afternoon
一般疑问句：Was there a football match yesterday afternoon
肯定,否定回答：Yes,there was./ No,there wasn't.
（4）there were some people in the street
否定句：there weren't some people in the street
一般疑问句:were there some people in the street
肯定,否定回答：Yes,there were./ No,there weren't.

Answer 3

There is a house.改为否定句和一般疑问句
There isn't a house.
Is there a house？