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"The cat's are" is a common error: an apostrophe mistakenly used where a plural is required. Below are clear rules, practical wrong/right pairs, quick rewrites for work, school and casual contexts, and a simple memory trick to help you fix sentences fast.

Short answer

Do not use an apostrophe to form plurals. Use an apostrophe only for possession (the cat's collar) or contractions (the cat's = the cat is). If you mean more than one cat, write The cats are.

Apostrophe + s (cat's) = possession (the cat's collar) or contraction (the cat's = the cat is).
Plural (more than one) = add s or es (cats, boxes) with no apostrophe.
Quick test: replace cat's with "cat is." If the sentence still works, it's a contraction; if you mean multiple cats, drop the apostrophe.

Core explanation: apostrophe vs. plural

An apostrophe marks possession (the cat's whiskers) or forms contractions (the cat's = the cat is). It does not form plurals. "The cat's are" mixes a possessive or contraction form with a plural verb, which breaks agreement and meaning.

Try this simple check: read the phrase as "the cat is"-if that makes sense for the sentence, keep the apostrophe and use a singular verb; if you mean more than one, remove the apostrophe and use the plural noun and verb.

Possessive: the cat's bowl (one cat owns the bowl).
Contraction: the cat's hungry → the cat is hungry.
Plural: the cats are hungry (more than one cat).

Wrong: The cat's are hungry.
Right: The cats are hungry.

Grammar note: subject-verb agreement (why the verbs matter)

Subject-verb agreement depends on whether the subject is singular or plural. A misplaced apostrophe can disguise the true subject and lead to the wrong verb.

Singular → singular verb: The cat is sleeping.
Plural → plural verb: The cats are sleeping.
If you see "The cat's are," remove the apostrophe first, then match the verb to the corrected subject.

Wrong: The cat's are sitting on the porch.
Right: The cats are sitting on the porch.

Hyphenation, spacing and apostrophe placement

Apostrophes must be attached to the word they modify-no spaces before or after. Contractions and possessives use an apostrophe, but spacing or hyphenation mistakes (cat 's, cat-s) look wrong and confuse readers and tools.

Correct placement: cat's (not cat 's or cat's ).
Never use a hyphen to form plurals: avoid cat-s, dog-s.
If unsure, remove the apostrophe, check the meaning, then fix spacing and verb agreement.

Wrong: The cat 's are outside.
Right: The cats are outside.

Common wrong/right examples (six essential pairs)

Scan these pairs when proofreading-each wrong sentence uses an apostrophe where a plural is correct.

Wrong: The dog's are barking all night.
Right: The dogs are barking all night.
Wrong: The student's are confused about the assignment.
Right: The students are confused about the assignment.
Wrong: The teacher's are handing out the exams.
Right: The teachers are handing out the exams.
Wrong: The child's are noisy in the hallway.
Right: The children are noisy in the hallway.
Wrong: The team's are arriving early.
Right: The teams are arriving early.
Wrong: The cat's toys are under the couch.
Right: The cats' toys are under the couch.

Work examples: professional emails and reports (3 realistic fixes)

An apostrophe error in professional writing can reduce clarity or credibility. These fixes keep a formal tone while correcting the plural.

Wrong: The client's are scheduled for onboarding next week.
Right: The clients are scheduled for onboarding next week.
Wrong: The engineer's are finalizing the deployment plan.
Right: The engineers are finalizing the deployment plan.
Wrong: The project's are on hold.
Right: The projects are on hold.

Try your own sentence

Test the whole sentence rather than the isolated phrase-context usually makes the correct form clear.

School examples: essays, assignments and feedback (3 realistic fixes)

Small punctuation errors can affect grades. These quick corrections are suitable for essays, emails to instructors, and assignment notes.

Wrong: The student's are turning in homework late.
Right: The students are turning in homework late.
Wrong: The library's are closed on Sunday.
Right: The libraries are closed on Sunday.
Wrong: The class's are too large this semester.
Right: The classes are too large this semester.

Casual examples: texts, social posts and notes (3 natural fixes)

In casual messages, contractions are fine-just make sure plurals are formed correctly. These rewrites keep the original voice.

Wrong: The cat's are so funny in this clip!
Right: The cats are so funny in this clip!
Wrong: My friend's are bringing snacks.
Right: My friends are bringing snacks.
Wrong: The puppy's are adorable.
Right: The puppies are adorable.

Rewrite help: a short three-step fix + three rewrite examples

Three-step checklist: locate the apostrophe, decide whether it's possession/contraction or intended plural, then remove or keep the apostrophe and match the verb.

Step 1: Spot the 's-does it show ownership or shorten a verb? If not, it's likely a plural.
Step 2: Remove the apostrophe for plurals; replace 's with "is" for contractions in careful writing.
Step 3: Adjust the verb to match the corrected subject (is/are).

Rewrite:
Wrong: The cat's are hungry. Minimal: The cats are hungry. Smooth: Hungry cats waited by the door.
Rewrite:
Wrong: The student's are late. Minimal: The students are late. Smooth: Several students arrived late to class.
Rewrite:
Wrong: The team's are practicing. Minimal: The teams are practicing. Smooth: Multiple teams practiced on the field today.

Memory trick and similar mistakes to watch for

Memory trick: apostrophe = belongs or squeezes (possession or contraction). If the word doesn't mean "belongs to" or "is/has," don't use an apostrophe for a plural.

Watch these related errors that often appear alongside apostrophe-plural confusion.

its vs it's - "its" is possessive, "it's" = it is.
plural possessive: cats' toys (owned by multiple cats) vs cat's toy (owned by one cat).
decades/years: write 1990s, not 1990's.

Usage: Wrong: Its raining.
Right: It's raining.
Usage: Wrong: The 2000's were interesting.
Right: The 2000s were interesting.

FAQ

Is "The cat's are" ever correct?

No. "The cat's are" improperly pairs a contraction or possessive form with a plural verb. Use "The cat's" with a singular verb (The cat's hungry → The cat is hungry) or "The cats are" for a plural subject.

How can I tell whether to write cat's, cats or cats'?

Ask three questions: (1) Do I mean "cat is" or "cat has"? If yes, use cat's as a contraction. (2) Do I mean more than one cat? If yes, use cats (no apostrophe). (3) Is something owned by multiple cats? Then use cats' (plural possessive).

Should I change "The team's are" in a work message?

Yes. If you mean multiple teams, write "The teams are." If you mean the schedule or another possession, keep the apostrophe and specify the owned noun: "The team's schedule."

Why do people add apostrophes to plurals (apple's)?

Often it's a habit or confusion about apostrophe roles. Remember: apostrophes indicate possession or contractions, not regular plurals. Train yourself to ask whether the form means "belongs to" or "is/has."

Will a grammar checker catch "The cat's are"?

Many grammar checkers flag apostrophe misuse and suggest the plural. Use a checker for quick catches, but practice the simple tests above so you can fix errors without relying on tools.

Check a sentence quickly

Run the three-step test: spot the 's, ask whether it means possession or contraction, then match the verb. If you still doubt, rewrite to avoid ambiguity (e.g., "The cats are" or "The cat is"). A quick habit scan prevents most mistakes.