Is there a pizza?
Yes, there is
Make two sentences with there isn't and there aren't
...
Is there any water?
No, there isn't
Where's the lamp?
On the desk
Where's the big plant?
Next to the desk
What's this?
A sofa
Make two sentences, one with there is and one with there are.
...
Are there any eggs?
Yes, there are.
What's this?
An armchair
Where's the carpet?
Under the bed