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by lcnPylGDnU4H9OF 1343 days ago
To expand on this, it's commonly believed that sign languages are simplified versions of the local spoken language. Indeed, it wasn't until ~1960[0] that these languages were seriously studied as "real" languages.

At least part of the reason a Deaf person might have poor grammar in a spoken language is because said spoken language is almost always at least their second language.

[0] https://en.wikipedia.org/wiki/William_Stokoe#Sign_language_r...