I'm trying to understand something here, I have the following question I need to answer:
あなたの部屋はきれいですか？
to which I should answer something like
ええ、きれいなです。
Why is the question does not contain the な?
Actually, your question is right and your answer is wrong.
You will only use な after a "na-adjective" if you're modifying a noun/adjective with it, for instance:
あなたの部屋はきれいですか (anata no heya wa kirei desu ka) Is your room beautiful?
はい、きれいですよ (hai, kirei desu yo) Yep, it is beautiful.
きれい is not modifying any noun, therefore there's no need for using な in this.
But if you wanted, you could word your answer like this:
はい、きれいな部屋ですよ！ (hai, kirei na heya desu yo!) Yep, it's a beautiful room!
here we wanna state clearly that it is the room that has the quality of being beautiful, in order to do that we, then, need to attach な after the adjective, therefore:
きれいな部屋 (na-adjective + na + noun)
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I am starting to think that な-particle for adjectives is the special case of the の-particle which is usung for nouns. – Leo240 Jul 31 '18 at 11:18
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It is simmilar in function in a way that it sort of connects the na-adjective to the word, the same way the の particle connects two words. But maybe if you think about it too much, you'll be confused when you start seeing explanatory sentences with なのです -> japanese.stackexchange.com/questions/60454/… – Felipe Oliveira Jul 31 '18 at 13:07
