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ING form The ing form of to boil is "boiling" or "boilling"? And why?

Corrections · 6

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https://dictionary.cambridge.org/fr/dictionnaire/anglais/boiling
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Thank you!!!
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boiling
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It's a common pattern for words with a double vowel before a single "L" in the noun form to retain only a single "L" in the present, "ing", verb form: "Failing", "feeling", "boiling", "grueling", "dealing", "mailing", "schooling", "appealing", "prevailing", "sailing", "wheeling". For words without a double vowel or consonant before the "ING", spelling variations with both singular and double "LL"'s often exist in different English spellings.
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I don't know how to explain the "why," though. English grammar is weird. :)

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