Relative clauses in Japanese?
Basic relative clauses in Japanese are fairly easy, like りんごを食べた男の子はあそこにいる。What I'm confused about is a noun clause (I think that's what it's called). For example, "I don't know who to ask about this", or "I ask him what they were talking about". I haven't heard that many people using sentences like that, so I'm wondering if it's just a sentence that only exists in English? And if it does, is forming a noun clause in Japanese any different than a regular relative clause?