Rule says: In a positive degree if a word ends in a consonant and there's a short vowel before the consonant, then we double the last consonant and add -er or -est.  Example: big -> bigger -> biggest  Why don't we apply this rule to Grey?  Grey -> greyyer -> greyyest
Initially, my question was: is "focussed" or "focused" the correct past tense of "focus", but since this applies to a lot of words, I would like to generalize and ask: is there supposed to be a rule when to double the consonant?
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