Grammarama

Their vs. There vs. They're

Their is the possessive form of “they.” There can be used in several different ways, mostly to refer to that point or location (as opposed to here, which refers to this point or location) or in conjunction with the verb ”to be” – for example, “there is” “there are” or “there must be” – to introduce a clause. They’re, meanwhile, is a contraction for “they are.”

Examples:

That’s their business, not ours.
“Do you want me to stand here or over there?”
Those kids are brats. They’re spoiled rotten.
Camels store fat in their humps.
There are five vowels and 21 consonants in the English alphabet.
Stay away from black widow spiders; they’re extremely poisonous.