So let's discuss one of my pet peeves. I've said it before, and I'll say it again...I'm a grammar snob. It drives me nuts when I see people improperly using words. Let's start with forms of the word "THEY." You have:
These are so often misused, so take a lesson from me
We'll start with the first one...THERE...its purpose is to denote a PLACE, as in 'over there,' or we went 'there' last night....or in another form such as 'is there a problem?'
Secondly, we have THEIR...this should be used to identify PEOPLE and their possessions...'their' house is beautiful. 'That car is theirs.'
Lastly, but by no means least, is THEY'RE...for the love of pete, only use this as a shortened form of THEY ARE. It's that simple.