I translated it as "This fountain?", and it was incorrect. How would you say "This fountain?" or "Is it this fountain?".
Цей фонтан - This fountain
Це цей фонтан? - Is it this fountain?
when you ask anyone in front of your eyes normaly we use Is, am,
I have written "Is this a fountain?" and was incorrect, why?
I wrote "Is that a fountain" instead of "Is this a fountain". I think both should be correct.