Homophones: They're, their and there

These three homophones are often used incorrectly even by native speakers.

They’re (short form) = they are

My children have gone on holiday and they’re in Germany today.

Their (possessive word)

The cats always leave their hair all over the place.

There has two uses:

1. (adverb of place) = in that place. Think of it as an answer to the question “where?”.

The post office is over (where?) there.

2. with the verb "to be" (with phrases such as "there is", "there are" etc)

There are 26 apples in the basket.

Practice:

http://www.better-english.com/easier/theyre.htm

http://a4esl.org/q/h/mc-ttt.html