PunctuationHas accepted answer

Unsure about using apostrophes with plural nouns that already end in 's'—help needed!

Asked byDevon StylePosted Mar 28, 2026 5:29 PM3 answers22 upvotesCanonical URL

I'm editing a report for school and I'm getting really confused about apostrophes with plural nouns, especially ones that already end in 's.' For example, I'm writing about several buses and their routes. Should I write "the buses' schedules" or "the buses's schedules"?

Similarly, if I'm talking about the projects belonging to several teachers, is it "the teachers' projects" or "the teachers's projects"? I'd really appreciate some help figuring out the correct way to show possession in these cases. Thanks!

Context:
American English, formal writing for high school

What to Know

Question You Likely Still HaveDirect AnswerHow To Apply It
What is the core rule for unsure using apostrophes plural?Pattern: For plurals ending in 's' : [plural noun] + ' = possessive For singular nouns or irregular plurals not ending in 's': [noun] + 's = possessive Examples: The buses' schedu…When working with plural nouns that already end in 's' , show possession by simply adding an apostrophe after the final 's' —do not add an extra 's' after the apostrophe.
How do I apply unsure using apostrophes plural in a sentence like mine?When working with plural nouns that already end in 's' , show possession by simply adding an apostrophe after the final 's' —do not add an extra 's' after the apostrophe.Here’s how you can check yourself as you edit: Correct construction: For regular plurals ending in 's', make them possessive by adding only an apostrophe after the 's' : The emplo…
What mistakes should I avoid with unsure using apostrophes plural?Here’s how you can check yourself as you edit: Correct construction: For regular plurals ending in 's', make them possessive by adding only an apostrophe after the 's' : The emplo…The buses’ route maps (routes of all buses) The teachers’ meeting (meeting for multiple teachers) Practice suggestion: Review your sentences: If the noun is plural and ends in 's'…

3 Answers

ByCoach LeeMar 28, 2026 5:49 PM9 upvotesAccepted answer

When working with plural nouns that already end in 's', show possession by simply adding an apostrophe after the final 's'—do not add an extra 's' after the apostrophe.

Pattern:
  • For plurals ending in 's': [plural noun] + ' = possessive
  • For singular nouns or irregular plurals not ending in 's': [noun] + 's = possessive
Examples:
  • The buses' schedules (multiple buses, schedules belonging to all)
  • The teachers' lounge (shared by all teachers)

Contrast:

  • The children's books (plural not ending in 's': add 's)
  • The boss's office (singular noun, add 's regardless of final letter)
Practice:

Try writing the possessive form for these:

  • the cars of all the players
  • the homework of the students

Self-edit tip: If the base noun is plural and ends in 's', just add an apostrophe right after—the word won't get another 's.'

ByCoach LeeMar 28, 2026 6:09 PM7 upvotes

Let’s compare plural and singular possession rules side by side for clarity.

Singular noun: Add 's for possession, even if the noun ends in 's'.

  • The bus’s horn (horn of one bus)
  • The class’s project (project of one class)

Plural noun ending in 's': Add only an apostrophe after the existing 's'.

  • The buses’ route maps (routes of all buses)
  • The teachers’ meeting (meeting for multiple teachers)

Practice suggestion:
Review your sentences: If the noun is plural and ends in 's', just add an apostrophe. If it's singular (even if ending in 's'), use 's.

Try transforming: “The offices of the managers” and “The recommendations of the judges” into possessive phrases.

ByNora GrammarMar 28, 2026 6:29 PM6 upvotes

You're right to notice that apostrophes with plurals ending in 's' can be confusing! Here’s how you can check yourself as you edit:

Correct construction: For regular plurals ending in 's', make them possessive by adding only an apostrophe after the 's':

  • The employees’ suggestions (suggestions from multiple employees)
  • The cats’ toys (toys belonging to several cats)

Common mistake: Don’t write "employees’s" or "cats’s" for plurals; reserve ‘s for singular nouns or irregular plurals:

  • The child’s toy (one child)
  • The children’s toys (plural, does not end in 's')

Quick practice:
Look at your own writing and underline the possessive plurals. If there’s an extra ‘s’ after the apostrophe, remove it. Try changing “the players’s uniforms” to its correct form.

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