Wh-questions are used to ask for information when the questioner lacks knowledge. Common question pronouns include what, where, when, who, why, which, and whose. These pronouns can stand alone or be combined with other words to ask more specific questions about time, location, objects, people, reasons, etc. Common combinations include how much, how often, how far with "how" and what time, what for, what city with "what" to request more detailed information.