I recently started to learn japanese, and I'm having trouble to distinguish some of it's phrase structures. I learned that だ is often used in informal situations representing the です form and か is used to represent a question.
What I really like to know is if the なんだこれ can be used as an answer for これわなんだか. For example:
これわなんだか - What is this?
I don`t know, なんだこれわ.
I'm sorry if it sounds a noobie question, but I get a hard time figuring out how it's structures, because there isn't always a pattern, for instance, I know about SOV fundamentals, I just don't get the other possible combinations.