1. Excuse, please.
Guys, it's "excuse me, please." Every time I hear this on the train I have to fight the urge to reply, "excuse who?" and not move aside.
2. Pronouncing the word "liaise" as "lie-us".
It's pronounced "lee-eh-zz", not "liars". I swear if I hear someone call me a liar(s) again I'm gonna punch him/her in the ear.
3. Could of, should of, would of, must of
It's could've, should've, would've, must've. Why the hell is that so hard to get???
Your Friendly Neighbourhood Grammar Nazi