People tend to think of prescriptive grammar—that’s the grammar your English teacher made you learn—as this almighty, unchanging force that has been there forever, like gravity or the sun. We forget that grammar rules are a human invention, and they’re constantly evolving. What’s considered “good grammar” today might have been totally unacceptable fifty years ago, or vice versa. Recall the word ain’t, which was once associated with high-class Brits—Winston Churchill was a fan—and has simply devolved since the early twentieth century to become one of the most stigmatized grammatical forms in
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