Formula de there is y there are afirmativo negativo interrogativo por favor?

Afirmativo :

There is + singular noun

Example :

There is a plant on the desk

There are + plural noun

Example :

There are pens on a chair

Negative :

There isnt / is not a plant on the desk

There arent / are not pens on a chair.

Questions :

Is there + singular noun + ?

Example :

Is there a cake on the table?

Are there + plural noun + ?

Example :

Are there many eggs in a fridge.