use there is or there are to give new information about something that exits or something that is present.
Statements
We use is (not) with singular or uncountable nouns.
Examples : There’s a visitor.
There isn’t any coffee.
We use there are (not) with plural nouns.
Examples : There are hundreds of new of new companies in Bangkok.
Questions
Is there ……………………….?
Are There ………………………?
Short answers
Yes, there is / there are.
No, there isn’t / there is not.
There aren’t / there are not.