Theirs is a third-person plural possessive pronoun. It’s also used as a gender-neutral singular possessive pronoun. It’s sometimes written as “their’s”—with an apostrophe—but this spelling is incorrect.
Possession is typically indicated by adding ’s to a word, but possessive pronouns are an exception to this rule. This means that “their’s” is always incorrect. This is also true for other possessive pronouns, such as ours and hers. The QuillBot Grammar Checker will fix this and other common mistakes automatically.
Examples: Theirs and their’s in a sentence ✗ I don't know if you can borrow this iPad. It's their's, not mine.
✓ I don't know if you can borrow this iPad. It's theirs, not mine.
✗ I wish I had a friendship as special as their's.
✓ I wish I had a friendship as special as theirs
The possessive pronoun theirs is used to show ownership of something by one or multiple people other than you. It’s related to the possessive determiner their. However, while their is used to modify a noun, theirs is used to replace a noun.
Examples: Their or theirs in a sentence
Lauren asked them for their opinion on the matter
Is this bike yours or theirs?
Theirs, their's or their'
Theirs is often written as their’s or theirs’ (with apostrophes), but both are incorrect. Theirs is the only correct spelling.
Examples: Theirs, their's or theirs' ✗ I didn't know you had two dogs! Oh no, one of them is their's.
✗ I didn't know you had two dogs! Oh no, one of them is theirs'.
✓ I didn't know you had two dogs! Oh no, one of them is theirs.
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