Language isn’t just about communicating information. It’s also used for communicating group status. As an obvious example, look at teen slang. By having things that “only we say” they have a sense of who “we” are in that. If it becomes necessary for a community to establish they’re “not the people in that next village over” then they’ll start changing their ‘slang’. Slang turns into dialect. Dialect turns into language. And poof, all kinds of grammar differences.
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