Star Wars fans might recall Obi-Wan’s Jedi mind trick in A New Hope when he tells stormtroopers, “These aren’t the droids you’re looking for.” Were Star Wars writers wrong about the placement of the preposition “for”? Should Obi-Wan instead have said, “These aren’t the droids for which you’re looking”? The latter sounds unnatural (and much more Yoda-esque, to be honest). Situations like these have caused grammar reformers to question or outright rebel against this “rule” about not ending sentences with prepositions. Prepositions explain one noun’s relation to another, often indicating where or when. They can tell you if a cat...