This may actually be one of my biggest pet peeves. People must have been sleeping through English class or just plain didn’t pay attention on how to use contractions and knowing what words to use in what situations.
I think the biggest ones are: there, they’re and their. WTF is so hard? How can you not tell the difference between the three? There is a directional word. It has nothing to do with people and possession. Well unless you’re saying “there’s my friend.” They’re really means you are saying “they are”. See the difference between that and “their”? Totally different meanings.
Another one is your and you’re. Again this is easy. You’re means “you are”. Can you see how that would be different from “your”? There’s so many more offenders that it’s not even funny. Why do people make these errors and mess ups? I just don’t get it.
What are some examples of bad grammar you hate?