The practice of leaving a preposition at the end of a sentence, often referred to as preposition stranding, has long been considered to be “against the rules”. Generations of teachers and grammarians have condemned it as a grammatical taboo.
That isolated, lonely preposition, separated from its noun, is known as a terminal preposition, and may also be described as danging, hanging or stranded.
Albeit with the best of intentions, this was drummed into me as a child, so I simply accepted it and tried to avoid doing so in whatever I wrote.
As I got older, though, I came to realise that it’s something we do very naturally in speaking. In fact, avoiding it in spoken English can make what one is saying seem very formal and stilted.
When I was in high school, one of my History teachers told us a story about one of Winston Churchill’s famous comebacks. On receiving a correction about finishing a sentence with a preposition in the draft of a speech, he responded, “This is nonsense, up with which I shall not put.”
As it turned out, it probably wasn’t Churchill who first made the joke. I don’t know if he ever did, despite numerous and varied attributions. It has also been attributed to various other people, and there are variations on the line that was said to have been delivered, so it’s hard to know who said what, and when.
Either way, the story demonstrates that the rule is actually a bit ridiculous.
So where did this rule come from? And is it something we still have to abide by?
Back in the 1600s, a grammarian named Joshua Poole developed some principles about how and where in a sentence prepositions should be used, based on Latin grammar.
A few years later, the poet John Dryden, a contemporary of John Milton, took those rules one step further when he openly criticised Ben Johnson— another great poet— for ending a sentence with a preposition. Dryden decreed that this was something that should never be done. Nobody bothered to correct or oppose Dryden, and Ben Johnson certainly couldn’t because he had been dead for years, so Dryden’s strident and public protestations popularised the principle into a rule. Over time, strict grammarians and pedants began to actively oppose the practice, and the rule became widely accepted and firmly established.
Ironically, despite all the wise and clever plays, poetry and essays written by John Dryden, it was his consistent complaint about the terminal preposition that became his most enduring legacy.
Fowler’s A Dictionary of Modern English Usage, published in 1926, calls it a “cherished superstition that prepositions must, in spite of the incurable English instinct for putting them late… be kept true to their name and placed before the word they govern.” Fowler goes on to assert that even Dryden had to go back and edit all of his work to eliminate the terminal prepositions in his own writing.
In the last century or so, people have become progressively less fussy and worried about it, but some still seem determined to cling to the rule no matter what.
I advise my students that in formal writing such as essays, speeches, official letters and submissions, it is best to avoid the terminal preposition just in case their reader is someone who might judge them for it. Any other time, in keeping with standard spoken English, they are free to use their prepositions wherever they feel most natural and make the most sense.
Nobody in the 21st century is going to naturally ask someone “On which char did you sit?” rather than “Which chair did you sit on?”, nor will they say “I wonder for whom that parcel is intended” Instead of “I wonder who that parcel is for.”
In the 21st century, that really is nonsense up with which we do not have to put.
Sources:
Quote Investigator
Merriam-Webster
Fowler, H.W (1926) A Dictionary of Modern English Usage. Oxford Language Classics, OUP, Reprinted 2002.

Is It OK to End a Sentence with a Preposition?
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