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Emily Blunt refused Steven Spielberg's offer to use AI for her alien voice in 'Disclosure Day'
(www.businessinsider.com)
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She also speaks russian and korean in the movie, I hope it sounded fluent to native speakers too. As someone who doesn't speak those languages it was very convincing.
As someone fluent in Alien, I can confirm she sounded like gibberish, but the accent was on spot.
It never does.
Though rarely it has to. Someone speaking multiple entirely different languages usually can't pronounce them all like a native speaker no matter how good they are, so small issues are perfectly acceptable.
It only really becomes a problem when movies try to convince us that it's supposed to be their native language, e.g Scarlet Johansson as the Black Widow - who is supposed to be a Russian spy.
Not a particularly good example to pick. She wouldn't be a very effective Red Room spy if she had a native Russian accent she couldn't disguise at all.
Should have picked something more like Tom Cruise... In anything.
I'm not saying she should have a Russian accent while speaking English - she is a spy, that would be stupid - but that Scarlet Johansson is pretty rubbish at speaking Russian, which her character should be perfectly fluent in as that's her native language.