Is ... a ...?
Is it a cat?
.... .... a ...?
Is it a dog?
Yes, ... ...
Yes, it is.
Is it a rabbit?
No, it's not. It's a frog.
This is a/an
an ox
This is a/an...
a frog
Is it a bird?
Yes, it is.
Is it a rabbit?
Yes, it is.
Is it a dog?
No, it's not. It's an ox.
No, ... not. ... a cat.
No, it's not. It's a cat.