(There is / There are) a banana
There is a banana
(There is / There are) apples
There are apples
Is there an onion? Yes, ...
Yes, there is.
Is there a potato? No, ...
No, there isn't.
Are there any cupcakes? No, ...
No, there aren't.
Is there a tomato? Yes, ...
Yes, there is.
(There is / There are) an apple
There is an apple
(There is / There are) donuts
There are donuts
Are there any tomatoes? Yes, ...
Yes, there are.
Are there any potatoes? No, ...
No, there aren't.
Is there a cake? No, ...
No, there isn't.
Are there any limes? No, ...
No, there aren't.
Is there a lime? No, ...
No, there isn't.
Is there an egg? Yes, ...
Yes, there is.
Are there any onions? Yes, ...
Yes, there are.
Are there any eggs? Yes, ...
Yes, there are.