Did your English teacher ever spend time on there, their, and they're practice? Surprisingly, it's a lesson that many students seem to have tuned out. These are short, simple words that often get misused.
"There," "their," and "they're" are homophones. That means they sound the same but have different meanings and spellings. For those who are new to the English language, homophones can seem rather daunting.
Don't panic, let's go over the basic rules for "there," "their" and "they're" and then put that learning into practice. In short, "there" is used to indicate something - i.e. that lamp over there - "their" is used to show possession - i.e that is their lamp - and "they're" is a contraction of "they are" = i.e. they're fond of that lamp.