What is the positive statement of the question "Whose frying pan is this?"
I mean How can I transform from question to the positive statement. What would it look like? I hope I explain myself understandably.
I believe such a statement is called "declarative", not "positive" (that is, it could be negative too, and still declarative).
I wonder who is the owner of this frying pan.
is of course fine, and a more strict example would be
I want to know whose frying pan this is.
Note the change in the order between "this" and "is".