Subordinate wh-interrogative clauses are introduced by a question word (who, what, which, where, etc.) and they don't usually have subject operator inversion (the verb is not in the interrogative form). They can function as:

  subject: Why they did that remains a mystery.

direct object:

Oh, I don´t know where the Eiffel tower is. I´ll ask a policeman.

  subject complement: The problem is who will play as goalkeeper.

  appositive: Your first question, why Paul did not inform us of the incident,  will be answered at the end of the meeting.

  adjectival complementation: I am not sure what you mean.

  prepositional complement: Jeremy did not talk to us about who should become president of the company.

Can you tell me where you work? This question sounds more polite than: where do you work?