Possessive plurals and plurals' possessives

academics English grammar
By Alison

Within the realm of punctuation, apostrophes on plurals and possessives can also lead to questions. There are patterns for forming plurals, though, and so that you do not have to wonder about when and where to put an apostrophe.

Rules for when and where to place an apostrophe

1. When the possessor is a regular singular noun

The most basic case of possession is signifying when a single person or object has ownership over something else. The rule for this in English is simply to add an apostrophe + "s" to the end of the noun that is doing the possessing. For example, if Alison owns a blue car, then it is Alison's car. Easy enough.

2. When the possessor is a singular noun that ends in "s"

Some names and objects, even when singular, end in "s". For instance, what if Jess has two pencils? Jess also has a name that ends in "s", which means that putting an apostrophe and "s" after it might look funny, even though we know that is the standard way to denote possession in English. There are two ways to write the pencils of Jess:

  1. An apostrophe and "s" after her name, just like always, even though it looks a little clunky: Jess's pencils are sharp.
  2. For those who do not like the look of so many "s", you can eliminate the "s" after the apostrophe to make a cleaner possessive: Jess' pencils are sharp.

Both of the above ways are grammatically acceptable. Personally, I prefer the second way because it sort of seems like the path of least resistance, in terms of punctuation marks. However, some may prefer the first way because it is more clearly obvious that Jess is a possessive in this context.

The same applies to a family name that ends in "s", such as the Jones family.

The Jones's dog barks a lot.

The Jones' dog barks a lot.

If a family name does not end in "s" then you must first make it plural and then add a possessive apostrophe if you are trying to convey that the whole family is the possessor.

The two cats that belong to the Smith family are the Smiths' cats.

3. When the possessor is a plural noun

In general, the rule for making a singular noun plural in English is to add an "s". When this is the case and the plural noun collectively possesses something, put the apostrophe after the "s" to show that the thing is owned by all of the members of the plural group and not just one. 

If one kid has a popsicle, it's the kid's popsicle.

When a lot of kids have popsicles, they are the kids' popsicles. (And if multiple kids are sharing just one popsicle, that popsicle is still the kids' popsicle because all of the kids are in possession).

4. When the possessor is a plural noun that does not end in "s"

Children is the plural noun of child. So how do you say that the classroom belongs to all of the children? The same way you would with a singular noun: add an apostrophe + "s" to the end of the noun.

The children's classroom is painted yellow and blue.

Many people mistake this type of situation by writing childrens' because it resembles the situation described above in which an already plural group is possessing something (as in the kids' classroom). The difference here is that children is a collective noun, meaning it signifies a plural but acts as a singular noun would in the sentence. It is an irregular plural because it is not formed by simply adding an "s" to the end of its singular form (childs is not the plural of child, whereas kids is the plural of kid). 

Comments

topicTopics
academics study skills MCAT medical school admissions SAT expository writing college admissions English MD/PhD admissions strategy writing LSAT GMAT GRE physics chemistry math biology graduate admissions academic advice ACT interview prep law school admissions test anxiety language learning premed MBA admissions career advice personal statements homework help AP exams creative writing MD study schedules computer science test prep Common Application summer activities history mathematics philosophy organic chemistry secondary applications economics supplements research 1L PSAT admissions coaching grammar law psychology statistics & probability legal studies ESL CARS SSAT covid-19 dental admissions logic games reading comprehension engineering USMLE calculus PhD admissions Spanish mentorship parents Latin biochemistry case coaching verbal reasoning DAT English literature STEM excel medical school political science skills AMCAS French Linguistics MBA coursework Tutoring Approaches academic integrity chinese letters of recommendation Anki DO Social Advocacy admissions advice algebra artificial intelligence astrophysics business cell biology classics diversity statement gap year genetics geometry kinematics linear algebra mechanical engineering mental health presentations quantitative reasoning study abroad technical interviews time management work and activities 2L DMD IB exams ISEE MD/PhD programs Sentence Correction adjusting to college algorithms amino acids analysis essay art history athletics business skills careers cold emails data science dental school finance first generation student functions information sessions international students internships logic networking poetry resume revising science social sciences software engineering tech industry trigonometry writer's block 3L AAMC Academic Interest EMT FlexMed Fourier Series Greek Health Professional Shortage Area Italian Lagrange multipliers London MD vs PhD MMI Montessori National Health Service Corps Pythagorean Theorem Python Shakespeare Step 2 TMDSAS Taylor Series Truss Analysis Zoom acids and bases active learning architecture argumentative writing art art and design schools art portfolios bacteriology bibliographies biomedicine brain teaser campus visits cantonese capacitors capital markets central limit theorem centrifugal force chemical engineering chess chromatography class participation climate change clinical experience community service constitutional law consulting cover letters curriculum dementia demonstrated interest dimensional analysis distance learning econometrics electric engineering electricity and magnetism escape velocity evolution executive function freewriting genomics graphing harmonics health policy history of medicine history of science hybrid vehicles hydrophobic effect ideal gas law immunology induction infinite institutional actions integrated reasoning intermolecular forces intern investing investment banking lab reports linear maps mandarin chinese matrices mba medical physics meiosis microeconomics mitosis mnemonics music music theory nervous system neurology neuroscience object-oriented programming office hours operating systems