How come we write drought and draught but pronounce [draut] and [dra: ft] or write enough and though but pronounce [i’naf] and [đou]?
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2Because it's English. – Hot Licks Nov 10 '18 at 12:45
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Short answer: the Great Vowel Shift.
Long answer: before the Great Vowel Shift began around 1400, there was a phoneme /x/ (written gh or ȝh) in Middle English. By Modern English, /x/ had either mutated to /f/ or had become silent in standard dialects.
Long vowels had generally shifted to become various diphthongs. Vowels are notoriously slippery characters in the continuing tale of the GVS.