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 ...
Is there any rhyme or reason to when one should double the last consonant when adding -ed or -ing? [duplicate]
Possible Duplicate: focussed or focused? The double consonant Sometimes, final consonants are doubled when adding -ed or -ing to the end of a verb whose penultimate letter is a vowel. ...