Many people think that because English is their native spoken language, they can write their English any way they want and it’ll be correct. Descriptivism notwithstanding, I don’t quite agree. How you write says things about you that go beyond what you write about. You might be a fine person, and it’s certainly correct to wear both trousers and a shirt, but wearing two kinds of plaid tells the ladies that you have no taste. Or that you’re a normal guy, but you get my point. (I learned the mismatched plaid thing from my wife.)
Amateurisms in writing show that you don’t know how to put words together correctly, and they label you as someone a bit lacking in the language department, and hence where else you might be lacking?
I’d cause needless anxiety if I didn’t give a few examples. If you’re not guilty of any of these, you can be confident that you’re at least on the level of the guy who knows enough to match his socks.
Rest assured. It’s not “be rest assured.” This expression is a perfectly normal metaphor for safety. You can go to bed without needing to worry about something. I found several good comics with “rest assured” in the caption, but I chose this picture because my colleagues think I look and act like this guy. I see we both wear our watches on our right wrists!
You, not “yous” or “youse.” (How do you spell a word that’s always wrong?) In high school one of the ladies in the cafeteria was friendly, and she would converse with us, but she said things like “I’m glad youse are such good kids.” Nobody ever said anything, but we all marked her as someone who would never advance beyond being a table cleaner in a school cafeteria.
All of a sudden. Don’t say “All of the sudden.” I don’t know why, but the “the” is incorrect, and it marks you like the cafeteria lady.
All, not “alls.” All you have to do is never say “alls.” It’s like pronouncing the “t” in often. Don’t do it.
Yeah, not yea. “Yea” (yea is pronounced yay) is an old word for “yes,” and now we use it only in voting. Yeah, admittedly pretty casual, is spelled with the “h” at the end.
I mentioned two others in a recent post, irregardless and preventative. Don’t write those words, either.