Know the difference between there, their and they’re.
There, their and they're are three very common words in English. Because they occur so often in a piece of writing, you must choose the correct form. Otherwise, you will indicate to your reader that you cannot control simple, everyday words.
Here are the differences:
There indicates location (Swedish=där)
Grandpa sits over there, dozing in front of a baseball game. [There indicates location.]
Their is the possessive pronoun that means belonging to them. You use this form when you are showing ownership. (Swedish=deras)
My neighbors are always complaining about the Heinmillers because their weedy lawn and barking dogs ruin the beauty and peace of the street. [The lawn and dogs belong to them, the Heinmillers.]
They're is a contraction for they are. If you cannot substitute they are in the sentence and have it make sense, you are using the wrong word. (Swedish=de är)
After their long run in the hot sun, the dogs are in the kitchen where they're [or they are] stretched out on the cool tiles.