Apostrophe Rules for Contractions and Possession

Reviewed by the Grammarlyzer Editorial Team · Our Review Standards · Published January 22, 2026 · Updated July 16, 2026

Separate Contractions and Possession from Ordinary Plurals

Quick Answer

Use apostrophes for:

  • Contractions: don't, can't, it's (it is)
  • Singular possession: Sarah's book, the dog's tail
  • Plural possession: students' grades, the teachers' lounge

Do not add apostrophes to ordinary plurals: bananas, CDs, 1990s

Memory Trick: Apostrophes can show missing letters or ownership; ordinary plurals do not need the mark.

🔑 Key Takeaway

Apostrophes show missing letters (contractions) or ownership (possession). In the sale-sign example, apples is an ordinary plural, so write "Apples for sale" without an apostrophe.

The Three Jobs of an Apostrophe

This guide focuses on three apostrophe jobs: marking omitted letters, marking noun possession, and clarifying certain letter plurals under some style guidance.

Job Rule Examples
Contraction marks missing letters do not → don't, it is → it's, they are → they're
Singular possession add 's Sarah's car, the dog's bowl, today's date
Plural possession plural ending in s → add ' only the students' grades, the Joneses' house
Irregular plural possession plural not ending in s → add 's the children's toys, the men's room
Ordinary plurals no apostrophe apples, the 1990s, several CEOs

Common Mistakes

❌ Incorrect:

Fresh apple's for sale.

✓ Correct:

Fresh apples for sale.

A plain plural does not take an apostrophe. Here, apples names more than one apple and shows no possession.
❌ Incorrect:

The company lost it's biggest client.

✓ Correct:

The company lost its biggest client.

"It's" only ever means "it is" or "it has." The possessive "its" has no apostrophe — like his, hers, and theirs.
❌ Incorrect:

The student's all passed the exam.

✓ Correct:

The students all passed the exam.

Here "students" is just a plural subject — no ownership — so no apostrophe. Add one only if something belongs to them: "the students' results."
❌ Incorrect:

We visited the Smith's for dinner.

✓ Correct:

We visited the Smiths for dinner.

To make a family name plural, just add -s (the Smiths). Use an apostrophe only for possession: "the Smiths' house."

🎯 Test Your Knowledge

1. Choose the plural: "Two ___ ran across the field."

2. The ___ playground was repainted.

3. The team celebrated ___ victory.

4. All of the ___ badges were reissued (many employees).

5. The band formed in the ___.

Try It: Apostrophes in Real Text

The opening sentence uses apostrophes in two ordinary plurals. Run the recorded example, then use the noun-role test even if the engine returns no issue.

Manual revision: The cafe sells fresh bagels and the staff love their jobs. Both words are plain plurals, not possessives, so neither takes an apostrophe.

In our July 16 browser test, the engine returned no issues for both the apostrophe seed and the corrected sentence. The result demonstrates no coverage for this pattern; identify contraction, possession, owner number, or ordinary plural manually.

Frequently Asked Questions

Where does the apostrophe go for a plural possessive like "students"?

When a plural noun already ends in s, the apostrophe goes after the s with no extra letter: "the students' grades," "the teachers' lounge." Irregular plurals that don't end in s take apostrophe + s: "the children's books."

Why doesn't "its" take an apostrophe when it shows possession?

Possessive pronouns (its, his, hers, ours, yours, theirs) do not use apostrophes. "It's" with an apostrophe is the contraction of "it is" or "it has."

Is it ever correct to use an apostrophe to make a word plural?

Do not add an apostrophe to ordinary plurals, decades, or acronyms: apples, the 1990s, several CEOs. Some style guidance uses apostrophes for lowercase-letter plurals when needed for clarity, as in p's and q's.

Source-Backed Rule Boundaries

Check the noun role

Apostrophes mark omitted letters and noun possession. Possessive pronouns already encode ownership, and ordinary plurals do not need an apostrophe.

See Purdue OWL’s apostrophe guidance for contraction, possessive, pronoun, and lowercase-letter examples.

Real-World Examples

📏 Contraction:

Don't forget to submit the report. (do not)

Apostrophe replaces omitted letters
📏 Possession:

Sarah's presentation was excellent.

Apostrophe + s = belonging to Sarah
📏 Plural Possession:

The students' grades were posted. (multiple students)

Apostrophe after the 's' for plural nouns
⚠️ Irregular Plural:

The children's playground needs repair.

Irregular plurals (children, women, men) add 's — not s'
⚠️ Pronouns:

The dog wagged its tail. (possessive pronoun)

The possessive pronouns its, yours, hers, and theirs do not use apostrophes. Pronoun contractions such as it's do.
❌ Grocer's Apostrophe:

Fresh apple's for sale!

Here, 'apples' is an ordinary plural rather than a possessive noun, so it takes no apostrophe.
❌ Common Mistake:

The Jones's are coming to dinner.

Wrong: for plural family names, add -es with no apostrophe: 'The Joneses.' Use apostrophe only for possession: 'the Joneses' house.'
❌ Common Mistake:

The 1990's were a great decade.

Decades used as ordinary plurals take no apostrophe: 1990s.
💡 Three Rules:

1. Contractions: the apostrophe replaces letters. 2. Noun possession: check whether the owner is singular or plural. 3. Possessive pronouns such as its, yours, and theirs use no apostrophe.

These checks cover the core patterns taught in this guide.
💡 The Test:

First try expanding a possible contraction (it's → it is). For ownership, distinguish noun possession from a possessive pronoun, then check whether the noun owner is singular or plural.

Use this as a first pass, then check style-specific clarity cases.

Why Apostrophes Are So Easy to Misuse

Apostrophes mark both omitted letters and noun possession, while possessive pronouns such as its and theirs use no apostrophe. Identify the word’s role before adding the mark.

For more practice, see Its vs It's and Your vs You're.

Related Articles

Check Your Writing Now

Use the checker for a mechanical pass, but apply the noun-role and owner-number tests yourself. The recorded ordinary-plural seed returned no issues.

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