Mine is people who separate words when they write. I’m Norwegian, and we can string together words indefinetly to make a new word. The never ending word may not make any sense, but it is gramatically correct
Still, people write words the wrong way by separating them.
Examples:
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“Ananas ringer” means “the pineapple is calling” when written the wrong way. The correct way is “ananasringer” and it means “pineapple rings” (from a tin).
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“Prinsesse pult i vinkel” means “a princess fucked at an angle”. The correct way to write it is “prinsessepult i vinkel”, and it means “an angeled princess desk” (a desk for children, obviously)
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“Koke bøker” means “to cook books”. The correct way is “kokebøker” and means “cookbooks”
I see these kinds of mistakes everywhere!
Not OP, but I think I could answer.
Traditionally, mail is uncountable. One can count letters and packages, but not mail. Thus “I received three mails” is currently grammatically incorrect, while “I received three pieces of mail” or “I received three letters” or “I received three packages” would all currently be grammatically correct.
It seems logical that email should follow the same rules of grammar. Thus “I received three emails” should be incorrect, while “I received three pieces of email” or “I received three messages” would all be grammatically correct.
But English grammar is not consistent. Email is a new word and the folks that use it have decided that it is countable.
I don’t mind this, but it seems OP does.