There, their and they’re
To be fair, the common misuse of these words is a result more often of typos and the writer not concentrating, than of confusion of the meanings. But because the pronunciation of them all is the same, it’s often difficult for some people to remember which one to use in which situation.
there – shows placement
I’ve heard that Brisbane has a great little lagoon in the beach, but I’ve never been there.
their – possessive form of “them”
They took their surfboards along to California.
they’re – a contraction for “they are”
They’re not staying in the hotel this week.