Let's face it: English is hard. We live our whole lives learning and using it, and, even still, we struggle with putting the right string of words together. Everyone messes up a time or two, and that's perfectly OK. Often, we don't even know we're using the wrong word or making a mistake. But sometimes... sometimes people go overboard, and it makes grammar freaks like me go bonkers. Some mistakes are so common and get to be so irritating, in fact, that they become the bane of our existences. I have compiled a list of the most grievous offenses people often make that, if you're as obsessed with grammar like me, grind your gears like no other.

Be prepared — I am about to go full teacher-mode all over your bad English.

1. There/their/they're

Gotta start with a classic. This one is the OG grammar mistake, the one your second-grade teacher desperately tried to get you to understand so you wouldn't look like a fool by saying "over their" instead of "over there." Sorry, Mrs. Bennett--apparently, you failed.

2. Defiantly

Personally, this one is the worst for me. See that word up there? That is NOT the one you're looking for as a synonym for "surely" or "certainly"--that word would be "definitely." Defiantly is a completely different word, it doesn't mean what you think it does, and they really don't even look or sound the same.

3. Your/you're

COME ON, PEOPLE. THIS IS ENGLISH 101! No one owns a "welcome" ("your welcome") but you certainly can be welcome ("you're welcome").

4. Intensive purposes

I can understand how this would be confusing. The actual phrase is "intents and purposes," which sounds a lot like "intensive purposes," but they're not exactly the same thing. Though, in some contexts, I suppose "intensive purposes" might work OK, if your purposes just so happen to be super rigorous.

5. Should of

This is another case of when something sounds similar so you think it's right, but you're actually wrong. The phrase is "should have" or, when contracted, "should've," which sounds an awful lot like "should of." Even so, "of" is not a verb and grammatically "should of" makes no sense.

6. Tomarrow

It's "tomOrrow" not "tomArrow." Marrow is what's in your bones, not a reference to the day after today.

7. Whether/weather

This one seems fairly simple, but, alas, many still make this mistake. "Weather" refers to the conditions outside, while the other is what you would use in the phrase "whether or not."

8. Realest/realist

Unfortunately, "I'm the realist" means that you are the designated strictly-practical person, not the most genuine or cool.

9. Lose/loose

The only thing you can "loose" is some kind of ferocious beast onto your mortal enemy, not the keys that you misplaced this morning — that would be something you "lose." If you make this mistake, you lose in the grammar department (see what I did there?).

10. Then/than

Another basic one that people struggle to grasp. Use "then" for sequences, and "than" for comparison. DO BETTER, PEOPLE. DO. BETTER.

11. Affect/effect

"Affect" is a verb, while "effect" is a noun. There ya go, it's really that simple.

12. To/too/two

Oh boy. I won't even bother with this one, because you should already know. Not to be snobby, but I am deeply saddened by you if you are still confusing these three, especially if you're currently in school. Basic knowledge, guys. Please stop hurting my poor, grammar-obsessed soul.

13. Breath/breathe

Maybe you just forgot an 'e' or maybe you just don't know the difference, but one cannot "breath in deeply." "Breathe" is a verb, and "breath" is the noun. Sorry, but I have to take a deep "breathe" every time I see someone mess this up.