Kit Rhett Aultman@kandersonus again, this is only what I've heard and not fully confirmed, but it explains where the rule comes from. If you end a sentence with a preposition, then... there's nothing after it, so what does it provide contextual information about? And you're right that rephrasing around that rule makes it sound awkward. You also find you have to start more rigidly using the objective form of nouns, and... you'll see French grammar begin to slide in.
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