There is / there are

THERE IS

COUNTABLES IN SINGULAR

There is a car, there is one girl, there is an orange, there is no food*

UNCONTABLES WITH SOME

There is some butter in the fridge, there is some water in my glass…

THERE ARE

COUNTABLES IN PLURAL (WE CAN USE SOME)

There are some books, there are many kids, there are several pets, there are two cars…

THERE ISN´T

UNCOUNTABLES WITH ANY

There isn´t any sugar, there isn´t any water…

COUNTABLES IN SINGULAR

There isn´t a bus, there isn´t one pet…

THERE AREN´T

COUNTABLES IN PLURAL (WITH ANY)

There aren´t any pens, there aren´t any cars

All the theory and some exercises here:

https://english-at-home.com/grammar-there-some-any/