Possessive apostrophe error

Apostrophes mark possession or contractions; they do not form ordinary plurals. Below are clear rules, quick checks, and many before/after rewrites you can copy into emails, essays, or texts.

When you wonder "Is this correct?" run a three-step diagnostic and apply a short rewrite - both are included below.

Quick answer: When to use a possessive apostrophe

Use 's for most singular possessives (the manager's office). Use s' for plural nouns that already end in s (the managers' office). Don't use apostrophes with possessive pronouns (its, yours, ours) and don't use them to form normal plurals (apples, 1990s).

Singular possessive: add 's - Sara's phone
Plural possessive (plural ends in s): add only ' - the teachers' lounge
Plural possessive (irregular plural): add 's - the children's toys
Possessive pronouns: its, yours, ours - no apostrophe
Plurals: apples, CDs, 1990s - no apostrophe

Core rules (short, non-negotiable)

If a noun owns or is associated with something, use a possessive. For a single owner add 's. For multiple owners where the plural ends in s, place the apostrophe after the s. Possessive pronouns never take an apostrophe.

One owner: add 's - the student's laptop
Multiple owners (plural ends in s): add ' - the students' lockers
Irregular plurals: add 's - the men's room, the children's choir
Pronouns: its, yours, hers, his, ours, theirs - no apostrophe

Wrong → Right: My sisters car is new. → My sister's car is new.
Wrong → Right: The cats whiskers are twitching. → The cat's whiskers are twitching.

Common traps - its vs it's, plurals, names ending in s

Its (no apostrophe) is possessive. It's (with apostrophe) is a contraction for it is or it has. Don't add apostrophes to form plurals (apple's → apples). For names ending in s, choose a style and be consistent.

Its (possessive) vs it's (contraction)
Plurals: 1990s and CDs (no apostrophe)
Names ending in s: Chicago style prefers James's; some newsrooms use James'

Wrong → Right: Its been a long day. → It's been a long day.
Wrong → Right: The 90's fashions were wild. → The '90s fashions were wild. Or: The 1990s fashions were wild.
Wrong → Right: Thats the companies policy. → That's the company's policy.

Examples: real sentences with fixes (work, school, casual)

Each entry shows an incorrect sentence and one or more corrected alternatives. When meaning could vary, an alternate rewrite is included.

Work:
Wrong: Please review Johns report by Friday. →
Right: Please review John's report by Friday.
Work:
Wrong: The managers meeting is at 4. → Right (one manager): The manager's meeting is at 4. → Right (several): The managers' meeting is at 4.
Work:
Wrong: The companies assets were frozen. →
Right: The company's assets were frozen.
School:
Wrong: The students grades were released. →
Right: The students' grades were released.
School:
Wrong: Janes thesis was approved. →
Right: Jane's thesis was approved.
School:
Wrong: Several students essay was selected for the journal. →
Right: Several students' essays were selected for the journal.
Casual:
Wrong: Thats Peters bike. →
Right: That's Peter's bike.
Casual:
Wrong: Whats your brothers name? →
Right: What's your brother's name?
Casual:
Wrong: I love my parents cooking. → Right (possession): I love my parents' cooking. → Alternative (clarify): I love my parents' home cooking.
General: Wrong: The dogs collar was missing. →
Right: The dog's collar was missing.
General: Wrong: Its color is unusual. →
Right: Its color is unusual. (Correct - no apostrophe for possessive pronoun)
General: Wrong: The womens restroom is down the hall. →
Right: The women's restroom is down the hall.

Fix-your-sentence templates (three-step diagnostic + ready rewrites)

Run these checks in order, then apply one of the rewrite templates below.

Step 1: Is the word a possessive pronoun (its, yours, hers)? If yes, no apostrophe.
Step 2: Does the noun show more than one owner? If plural ends in s, add only '. If irregular plural, add 's.
Step 3: If singular owner, add 's.

Rewrite:
Original: The teams strategy was obvious. → Diagnostic: teams = plural. Rewrites: The team's strategy / The teams' strategy.
Rewrite:
Original: The editors note was short. → Fixes: The editor's note / The editors' note.
Rewrite:
Original: My neighbors dog barks at night. → Fix: My neighbor's dog barks at night. → If shared: My neighbors' dog barks at night. → Avoid ambiguity: The dog next door barks at night.

Try your own sentence

Test the whole sentence rather than a single word: context usually makes the right choice obvious. If you still aren't sure, rewrite using an of-phrase to remove ambiguity.

Memory tricks and quick editorial checks

Fast habits that catch most errors when editing or replying to messages.

Swap-in test: Replace "X's Y" with "the Y of X." If it sounds natural, use a possessive.
Contraction test: Expand it's to it is / it has. If expansion makes sense, it's is correct; otherwise use its.
Pronoun rule: Possessive pronouns (its, yours, hers, his, ours, theirs) never take an apostrophe.

Usage: The manager's decision → The decision of the manager (works) → use apostrophe.
Usage: It's been three hours → it is been (works) → it's.
Mnemonic: PRO = pronoun → no apostrophe (its = pronoun).

Hyphenation, spacing, and punctuation around apostrophes

Apostrophes attach directly to the word - no spaces. Compound ownership and punctuation follow standard clarity rules.

No space: write the company's policy (not company 's).
Compound ownership: if they share one item: Bob and Mary's house. If they own separate items: Bob's and Mary's houses.
Punctuation: apostrophes don't change comma/period placement inside or outside quotes; follow your variant's rules.

Usage: Wrong spacing: The company 's policy. → Right: The company's policy.
Usage: Compound ownership example: Alice and Bob's car (shared); Alice's and Bob's cars (separate).

Style guides and tone: choose a form and stay consistent

Different guides treat names ending in s and similar edge cases differently. Pick a style for your team or publication. When clarity matters, prefer rewrites using of-phrases.

Chicago: prefer James's. AP and some newsrooms often use James'.
Academic/legal: avoid ambiguity - rewrite ("the attorney for the defendants") when precise possession matters.
Casual: prioritize readability, but never use apostrophes for plurals.

Usage: Chicago: Charles's essay. | AP: Charles' essay. (Pick one and be consistent.)
Usage: Formal clarity: instead of "the defendants' attorney" write "the attorney for the defendants" when relationships could be misread.

Similar mistakes to watch for (and short fixes)

Confusion often shows up in contractions, decade abbreviations, and pluralization of single letters or acronyms. The same small checks fix most of these.

Contractions vs possessives: it's vs its, you're vs your - expand to check.
Decades: write 1990s or '90s, not 1990's (unless showing possession).
Letters: many guides allow p's for lowercase letters (mind your p's) to prevent confusion. Acronyms: write CDs (no apostrophe).

Wrong → Right: Put all your book's on the shelf. → Put all your books on the shelf.
Wrong → Right: The 2000's were confusing. → The 2000s were confusing. → Informal: The '00s were confusing.
Usage: Mind your ps and qs → Mind your p's and q's (style-dependent).

FAQ

When do I use its vs it's?

Its (no apostrophe) is possessive: "The company changed its policy." It's is a contraction for it is or it has: "It's been a long day." If you can expand it's to it is / it has and the sentence still makes sense, use it's; otherwise use its.

Should I write 1990s or 1990's?

Write 1990s (no apostrophe) to form the plural of the decade. Use '90s for informal references. Use 1990's only when showing possession.

How do I make names ending in s possessive?

Either add 's (Chris's) or just ' (Chris') depending on your style guide. Chicago favors Chris's; some news styles use Chris'. Be consistent. When in doubt, rewrite ("the book of Chris").

Can I use an apostrophe to pluralize letters or acronyms?

Many guides allow an apostrophe for pluralizing single lowercase letters (mind your p's) to avoid confusion. Do not use apostrophes for most acronyms or numbers (CDs, 1990s) unless a specific style requires it.

Is "teachers lounge's policy" correct?

No. If the lounge belongs to multiple teachers, write teachers' lounge policy. If it belongs to one teacher, write teacher's lounge policy. Better: the policy for the teachers' lounge.

Want a fast check for your sentence?

Use the three-step diagnostic above. If you're still unsure, paste the full sentence into a checker or rewrite with an of-phrase to remove ambiguity. For recurring issues, keep a short style note (e.g., names ending in s → add 's) so edits stay consistent.