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Timeline for Using "must" for certainty

Current License: CC BY-SA 4.0

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Nov 9 at 23:01 comment added OrangeDog That usage of "must" sounds very 19th Century. The sort of phrasing you might find in a Brontë novel.
Nov 9 at 1:13 history became hot network question
Nov 8 at 20:05 comment added FumbleFingers You're just confusing the issue by switching to Present Perfect, where there's no conditional element.
Nov 8 at 20:04 comment added Lambie @FumbleFingers The two go together. It must upset him that you (have) told him that. I'd say it is actually not grammatical as written.
Nov 8 at 20:01 comment added FumbleFingers ...if you keep telling learners that non-idiomatic constructions are syntactically invalid, they'll end up thinking it's impossible to learn the principles of English syntax, because there's so little consistency. That does them no favours.
Nov 8 at 19:57 comment added FumbleFingers @Lambie: Rubbish. It's perfectly grammatical, just no longer idiomatic. Because there are so many false positives, it's not easy to find examples from a couple of centuries ago, but they certainly exist. And the relevant "rules of grammar" haven't changed - just the idiomacy. ... if you do , it must cost you remorse and sorrow
Nov 8 at 19:40 comment added Lambie @FumbleFingers This: If you give Angelo the news now it must upset him. is not idiomatic and also not grammatical.
Nov 8 at 19:29 answer added James Mathai timeline score: 3
Nov 8 at 17:48 comment added FumbleFingers The cited usage is syntactically valid, and does convey the meaning you want - it's just not idiomatic. The standard way of indicating "emphatic certainty" in such contexts is: If you give Angelo the news now it's bound to upset him, so tell him later on. Well, that's "standard" in informal conversational contexts. In formal contexts you might consider ...it is certain to... or ...it will surely...
Nov 8 at 17:42 vote accept Ola
Nov 8 at 17:26 answer added Friendly Racoon timeline score: 5
Nov 8 at 17:25 history edited Barmar CC BY-SA 4.0
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Nov 8 at 17:10 history asked Ola CC BY-SA 4.0