Gramatical mistakes that are way too common

I make mistakes, but one that is like fingernails on a chalkboard for me is "I seen". It's either I saw or I have seen.

Ali g gets a grammar lesson from Andy Runey/Rooney

https://www.youtube.com/watch?v=P1EFyyoxa4k

Persuade versus convince: To convince means to change a person's mind, to persuade means to get them to take some action. You might convince me that a particular candidate is better in a political race, but you would persuade me to vote for that person.

Shall versus will: Now, at least in US English this difference is largely ignored and "shall" merely conveys greater formality. But in the first tense ("I" or "we"), "shall" indicates something that will naturally happen while "will" indicates something the speaker desires and intends to make happen. Oddly enough, in the second and third tenses the two are reversed -- "will" indicates something which will naturally happen while "shall" indicates something the speaker desires and intends.

So, if you're ever at sea and a man falls overboard and shouts, "I shall drown! No one will save me!" he is lamenting that his death is certain and nobody will be able to rescue him. But if he shouts, "I will drown! No one shall save me!" he is announcing his intention to drown and commanding that nobody interfere.

To me, "close-minded" still makes no sense: https://blog.writeathome.com/index.php/2012/06/close-minded-or-closed-minded/ It's too much like, "my bad," which seems to have replaced the tried and true, "my mistake." With the replacement, the notion of, "to err is human," is pretty much shot to hell, in my opinion.

Kind of like your-you're, and they're-there-their, there's also loose-lose. Too many times I see folks who write "loose" when they mean "lose."

affect/effect

I would cast scorn upon every idiot that screws up their posts with terrible grammar and spelling but I suspect I'm a big offender 😃

There are alot of them