For the verb ‘focus’ why is the gerund form ‘focusing’ with a single S, instead of ‘focussing’ with a double S? [duplicate]

Possible Duplicate:
“Focussed” or “focused”? The double consonant

The rule that I learned was that when you have a short vowel in the last syllable, you double the last consonant before adding the ending. Thus “cut” becomes “cutting”, or “beget” becomes “begetting”.

According to this rule, “focus” should become “focussing”. But the spell checker in my browser wants me to change that to “focusing”. This bothers me because I would think that would be pronounced something more like fo-kyoo-sing.

I looked this up, and apparently the Brits follow the rule, but Americans don’t. Any idea why? And what is the rule, then?

Answer

The American rule is that the final consonant is doubled only if the verb is stressed on that syllable and it is a short vowel.

Attribution
Source : Link , Question Author : KSwenson , Answer Author : tchrist

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