theirs
Translation
theirs
Examples
This book is theirs.
This book is theirs.
Our house is big, but theirs is small.
Our house is big, but theirs is small.
Grammar Patterns
((sth.)) is theirs The responsibility is theirs.
Similar Words
Synonyms: their own; Antonyms: ours, yours, his, hers
Etymology
From Old English *þeira*, genitive of *þeir* ('they'). The '-s' ending developed in the 14th century, similar to 'his' or 'yours'.
Memory Tips
It's 'their' + 's'. Remember it never has an apostrophe. 'It's theirs,' not 'It's their's.'