it is,that is,there is的区别是什么

Question

it is,that is,there is的区别是什么,请举类说明

Answer 1

It is...这是什么,往往还可以用来表强调

It is a cat.
It is you who has made a terrible mistake.

That is...那是..特指。还有一个意思，用在句中表"这就是说"
That is a dog.
A equals B ,that is, A has the same value as B.

There is...表存在，那里，这里有什么...
There is a military base in the desert.

Answer 2

它是 那个东西是 。。。有。。。
it is an apple.它是一个苹果
that is a school. 那是一所学校
there is a school in the city。 在这个城市里有一个学校

Answer 3

it is是“它是”
that is是“那是” 跟this is“这是”差不多
there is是“有”
注意：there is是there be中的一个，都表示“有”，具体情况根据主语的单复数！