Their, there, and they’re are commonly confused words, because they are homophones, which means that they are words that sound the same but mean different things.
The word their is a determiner, which is used to show belonging.
There, is an adverb, and is most commonly used to show location.
Whereas, they’re is a contraction of the words they are.
Rules
If you are struggling to remember which of these words is correct to use in a sentence, you can ask yourself three questions –
1. if I change the sentence in order to use a pronoun such as her or his instead, would the sentence still make sense?
If the answer is yes, then their is correct.
2. Am I discussing, or referring to, location?
If the answer is yes there is correct, which is a word that ends with another location word- here.
3.If I changed the word to they are, would the sentence still make sense?
If the answer is yes, they’re is correct.
The psychotic girls guide to surviving the human apocalypse 