Nobody uses British English

Are you saying that native speakers Lear grammar rules first without knowing how to spell the words?

Yes. They master the grammar rules without regard to whether they learn to write. Most native language users have a solid understanding of grammar at a time when their handwriting is still shaky.

In that case, it still doesn't make sense since it's not the spelling per se that's the issue but that you use the wrong word when writing it down, with should look wrong when you read it. (It’s fascinating how quickly children sort through and adopt grammar rules.)

This doesn’t follow as something that makes sense. Spelling errors might mean that the person doesn’t know how to spell, but it could also be that the person hasn’t given the writing any editing attention. As to looking wrong when you read it, one persistent proof-reading problem is missing a mistake because your brain tricks you into reading the text without a mistake. This is why people are urged to read the text backwards or to ask someone else to read it during editing.

Nonetheless, the written word is a representation of language. Mistakes in those representations are unlikely to work their way into a change in the underlying language.

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