Why are the present and the past participles of submit spelled with two t's?
The past tense of to occur is occurred (not occured), but the past tense of to listen is listened (not listenned). Why? What is the general rule that is applied to make the past tense of a verb?
Some verbs can have double Ls in the gerund form; for example: modeling; modelling traveling; travelling Which form should we use, or which form is used more in the literature?