Yes, there are.

No, there aren't.

Yes, there is.

No, there isn't.

is

are

There are two balls

There are three balls

There are four balls

There are six balls

There are three bridges

There is a bridge

There is two bridges

There aren´t two worms

There is two worms

There are two worms

There isn´t two worms

There is

There are five students in the classroom.

There is a bok on the board.

There are three teachers in the classroom.

There is a father in the classroom.

There are five books on the desk.

There is a car on the desk.

There is a coffee on the desk.

There is a computer on the desk.