comment: >
  
  It alarms me that this is such a common error (ditto your/you're, they're/there/their, etc). For non-native English speakers, I can see how it could happen. As for native English speakers, I'm not sure how much of an excuse there is. I remember having grammar lessons in elementary school. Has this stopped? Do people just not retain any of it?
context: Stop "saying" when you mean "writing".