One of the common mistakes in writing is the misuse of the words, their, they’re and there. They sound the same so the misuse is understandable. Here’s a brief description and differentiation of each word.
Their is a possessive pronoun meaning, “belongs to them.” Examples: Their school is in the middle of the city. They took their jackets off because of the heat.
They’re is a conjunction of 2 words, “they” and “are,” a pronoun and a verb. The long usage would be, They are eating in the cafeteria. The conjunction would be, They’re eating in the cafeteria. A dialogue: Who are they? They’re the San Antonio Spurs.
There is an adverb that depicts a place. A dialogue: Where is she? She is there at the church. Or She is over there.
If the proper grammar is not used, your thoughts will be everywhere but the right place.