Possible Duplicate: Is there any rhyme or reason to when one should double the last consonant when adding -ed or -ing? It has always been a word that intuitively I wish to spell with two ...
This form of the word is not very common but does see some use as the present participle/gerund of "to summit" as in "Upon summit(t)ing the mountain we took photos but had to begin our descent ...
Why are the present and the past participles of submit spelled with two t's?
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. ...