There is

=>

- There is a pen in my lovely pencil case.

– There is an apple in the picnic basket.

– There is one big tree in my grandparents’ garden.

There are

=>

– There are pens in my lovely pencil case.

– There are three apples in the picnic basket.

– There are many trees in my grandparents’ garden.

There are 7 rooms in my house

There are many trees in my school

There are 3 solutions to save the enviroment

There is a notebook on my desk

There is a ball in my brother's room

There is an apple in the fridge