There, their, they’re
These words are often used incorrectly. It isn’t difficult to see why, as they are pronounced identically. To make matters worse, “there” can be an adverb, a pronoun, a noun, an interjection or an adjective! The word “their” is a pronoun while “they’re” is a contraction of “they are”. We could dedicate an entire article to explaining just these three words. But here’s a sentence which demonstrates how they should be used:
There are several people over there who aren’t wearing their coats and so they’re going to get very wet.
When you use pronouns, including her, he and him, it is vital that your readers know to whom those pronouns refer. A pronoun without a clear antecedent is ambiguous.
David took his dog Toby for a walk yesterday, but he wasn’t feeling very well.
Who wasn’t feeling very well?
David wasn’t feeling very well when he took his dog Toby for a walk yesterday.
Here, it is much clearer that it was David who felt poorly.