Hi It turned out to be a bit difficult to me what is called "indirect questions" or "noun clauses with a question word". I`ve had problems specially when using the question word "who". So in order to conffirm If I`ve figure it out or not I would like to know if this answer is good. It still sounds a bit weird to me: Who is the mayor of New York City? I don't know who the mayor of New York City is.