Possessive S vs. Plural S
All right, folks, letâs get right down to what might be the most pervasive, most irritating, and most easily solved mistake in the English language. Native speakers are some of the worst offenders in this department: Iâve had at least one English teacher who couldnât get this right! And my question is, WHY? As youâre about to see, itâs really not that hard.
Letâs start with pluralisation, because who doesnât want to have more than one of something? No one, thatâs who. And hereâs a hint: itâs super easy. When you want to pluralise something, just add an S, no apostrophe. Itâs that simple, even if youâre using abbreviations or numbers.*
The 1920s were an interesting time.
*The general American stylistic choice is to add an apostrophe-S (âs) to abbreviations and time periods, but the apostrophe-S, as we will learn, is actually an indicator of possession. Some Americans will probably fight me on this, and I will fight right back. There is no need to say âCDâsâ or â1920â˛sâ to indicate plurality.
There are, of course, some exceptions, because language wouldnât be language without âem. For example:
Words ending in âOâ add an â-esâ when theyâre pluralised.
Can you fry up those potatoes?
But good news: thatâs about it!
A lot of people seem to get confused when a word ends in any vowel, and start throwing apostrophe-Ss around where they donât belong. Iâve seen many a coffee-shop menu board announcing that they have âsconeâsâ and âteaâsâ for sale, and I can tell you right now, they definitely donât! Why not, you ask? Because apostrophe Ss are only for possession.
Letâs start with the basics:Â itâs vs. its.Â
Itâs is a contraction of "it is." The apostrophe indicates that something was there but has now been removed, just like in âdonâtâ (do not) or âcanâtâ (cannot).
Itâs cold out today means exactly the same thing as It is cold out today.
Its is possessive: it means âthe thing(s) belonging to it.â
 âThe dogâs eyes were brownâ can be simplified to âIts eyes were brown.â
So you see thereâs no way to exchange âitsâ for âitâsâ while maintaining your intended meaning. âIt is eyes were brownâ doesnât mean anything, nor does âthe thing belonging to it cold out today.â
The its principle also applies when you want to denote possession with pronouns, like âher,â âhim,â or âtheir.â Again, you just add an S with no apostrophe:
The boots are his. (âHisâ is essentially a nicer-sounding contraction of âhims,â which isnât a word.)
But where this gets confusing is that an apostrophe-S tacked on to any proper noun (someoneâs name or title) also makes it possessive.Â
Those boots are the Generalâs.
Just remember that pronouns and proper nouns follow opposite rules for possession and youâll be fine! We do have another exception, but this is the last one, I promise.
For possessive plural nouns, you need an S-apostrophe (sâ), not an apostrophe-S (âs). Make sure youâre putting them in the right order; otherwise, it changes your meaning.
Correct: The Millersâ house, where âthe Millersâ are multiple people.
Incorrect: The Millerâs house, which means that The Miller is one person.
The same rule applies to all proper nouns ending in S.
Parisâ history is long and rich.Â
Francisâ hands were cold.
Technically, you can also add âs to a word that ends in S, but in your writing, you just have to pick one style and keep it consistent.
Parisâs history is long and rich.
Francisâs hands were cold.
Some singular nouns ending in S also take the S-apostrophe. Generally, if you would pronounce an extra syllable when you speak the word aloud, youâre safe to add an apostrophe-S. Otherwise, just an apostrophe will do.
The classâs field trip was fun.
The dogsâ barking disturbed her sleep.
And thatâs about it! Go forth, possess, and pluralise to your heartâs content.Â