This mistake is my pet peeve, mostly because I’m 26 and still struggle with it something fierce. All the others (two vs. to. vs. too, your vs. you’re, etc) never seem to even make it on my radar, yet the which-their-do-I-use-this-time argument is on repeat in my head.
There is for a place, as in “here or there.”
They’re is short for “They are.”
Their means it belongs to them (i.e- Their feet are stinky.)
Editing mistake of the week- Boss lady wrote a mass email to everyone suggesting “Freetime is metime! (Meaning stay out of my office during lunchtime.)”
I’m not sure about everyone else, but my lunch hour is me time, not “metime.”