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I came across an interesting distinction, courtesy of Teresa
Nielsen Hayden. "Up with which I will not put" is ridiculous,
because the verb isn't really "put" but "put up with." I
don't feel we need to worry about ending sentences with
prepositions, but if you do, try to keep track of whether it
makes sense to take the phrase apart: "The number they begin
with" can be turned into "the number with which they begin,"
because the verb is "begin" (and can be replaced with
"start" if you like); trying to put a near-synonym of
"put" into "put up with" would lose all meaning.