“Who” questions are a type of grammatical construction in the English language that are used to ask about the person or people involved in an action or situation. They are formed by using the pronoun “who” and adding the verb. For example: “Who is coming to the party?”, “Who broke this vase?”, “Who wrote this book?”. These questions are asking about the person or people involved in an action or situation. “Who” is used to ask about the identity of a person, it is used to refer to the subject of a sentence and it can also be used to inquire about the author, the performer, the owner or the maker of something.