It is the possessive case of who, and it acts as an adjective. Because the pronoun who’s is a contraction of “who is” and “who has,” it’s easy to confuse them with whose. Should I use whose or who’s? Whose shows the ownership or possession of something by someone and should be followed by a noun "Paul, whose eyes are red, hasn’t slept much all holiday." I’m Innocent’: Who’s in Congo’s Mass Graves? The police officer was not sure ____________ fingerprints those were, but she thought they belonged to the criminal. The word who’s is a contraction of the phrases “who is” or “who has,” while the word whose takes the possessive form of the pronoun who. Past tense:                Who’s left the warehouse? As frequent as contractions are, they are generally viewed as too casual for formal writing. This can be part of a statement or question about a person’s identity or something that a person has done. Grammarians use contractions every day, and they are easily spotted with the use of an apostrophe. Now try and complete the sentences below using whose or who's. Contractions using an apostrophe help consolidate two words into one. Common nouns use apostrophes to show possession. –, “Parents, guardians, partner NGOs whose job it is to care for children, and medical doctors were always on hand everyday, to ensure everyone had all they needed.” –, To remind Richardson: Marshall, who’s now with the Giants, said during a radio interview that he didn’t think he’d fare well on his former team because he believes the Jets don’t have much of a chance to win this season. Whether – How to Use Each Correctly. All these contractions use an apostrophe, as does who’s. For example. Remembering that contractions use apostrophes can help you know when to use who’s. Anyone who’s attended the show, whose name I can’t remember, knows why it reviewed poorly. There’s an easy way to keep track of these two words by look at the apostrophe. It’s important to note, however, that contractions are considered informal for written English, and it is advised to omit using them for academic audiences. Based on the first two examples, we can see how who’s is the right word to use because it’s grammatically correct to replace it with either “who is” or “who has.” However, note how “who has” only works if we change the following verb is past-tense. Correct: She is taking an ESL class, whose title I can’t remember. For example. "Who's that gorgeous girl in the next row?" However, the incorrect example uses who’s to ask which person is the television remote, which is an entirely different question. Incorrect:       She is taking an ESL class, who is title I can’t remember. Past tense:                Whose house were you at yesterday? When to use who’s: Who’s is a contraction of the pronoun who and either the verb is or has. Present tense:          Do we know whose purse this belongs to by chance? For example, in the contraction don’t, the apostrophe replaces the missing o. We don’t know whose dog keeps digging holes in our lawn but we intend to find out. Who’s that actor who always plays himself in films? It might help to consider the fact that the apostrophe replaces the missing letter or letters. The words "who's" and "whose" are homophones, meaning they sound the same but are spelled differently and have different meanings. These two homophones sound the same when spoken, but they are never interchangeable. The party was filled with the world’s elite. Incorrect:       Who’s the television remote? Additional examples of contractions include: See how well you understand how to use whose vs. who’s by choosing the correct word to fill in the blank. Whose and inanimate objects. Who’s is a contraction of who is or who has.A way to test that you have used this correctly is to substitute these phrases into your sentence. A Who’s Who is a book or list containing the names and biographies of famous or noteworthy people.For example, the British publication Who’s Who is published annually and contains information about some 30,000 notable Britons.As an idiom—usually within the phrase a Who’s Who of—the term is usually used to describe something that involves many noteworthy people.