From a previous post, we can identify these three little words, there, their, they’re , as homophones – they sound the same but have different spellings and meanings. But they are so easy to confuse, particularly if you are concentrating hard on the content of the writing! So, a quick and basic reminder of how these are used:
This is a contraction of they are.
The word they is a pronoun in the same way that she is a pronoun. A pronoun is a word that takes place of a noun. (He, she, it, we, they for example).
They are becomes they’re and is generally pronounced the same as there and their.
Sammy and Jane are having a party tonight. They’re inviting the whole street.
Tell me what they’re doing!
Be cautious when using this in writing: this is a very common spoken form but take care when you are using it in writing. Although contractions are increasingly common in formal writing, there is a time and a place to do so. Be very aware of the audience that you are addressing.
Used as an adverb
(place) On Tuesday, I went to the farm with my friends. I met them there.
(point/case/idea) I disagree with you there.
Used as a pronoun
It is used with a verb especially to be. The verb must agree with the true subject that follows.
There are some sweets left in the packet.
There is a dog in the room.
They were delighted when their dog won the show.
Their delight was obvious when their dog was awarded a prize.
For more information on there, their, they’re see http://www.collinsdictionary.com/dictionary/english/there