TIL: In American English, the general rule for whether to double the final consonant in "X-ing" is whether the last syllable is stressed.
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Replying to @tabatkins
It's more complicated -- for unstressed endings, based on a list of consonants that varies (for p & l) between UK/US English.

Jan 6, 2017 · 10:49 PM UTC

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Replying to @davidbaron @tabatkins
I have a thorough reference for this at home, with examples... although I'm not sure which 1 of 3 books it's in...
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Though I recall the canonical US/UK differences are travelling and worshipping (UK) vs. traveling and worshiping (US)
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more replies
Replying to @davidbaron @tabatkins
e.g. travelled vs traveled, cancel vs cancelled; I still regularly write failled instead of failed, too.