Podwajanie literek w -ingach

Cześć,

mam pytanie: kiedy podwajamy ostatnią literkę gdy używamy jakiegoś continuous'a.
Swimming, cutting, skiing etc.

Pozdrawiam i dzięki za pomoc.

The 1-1-1 Rule: Words of one syllable (hop), having one vowel followed by one consonant, need another final consonant (hop + ped) before adding endings that begin with a vowel. This rule does not apply to words with x since x has two sounds /ks/.

The 2-1-1 Rule:

Words of two syllables (be gin) in which the second syllable (gin) is accented and has one vowel followed by one consonant, need another final consonant (be gin + ning) before adding an ending that begins with a vowel. If the last syllable is not accented (en ter, prof it, bud get) do not double the final consonant before adding the ending.

...and there are exceptions, like 'formatting'

or 'travel - 'travelling (in BrEng only), dis'pel - dis'pelling (in both BrEng and AmEng), for example

There are exceptions to every rule...this is the English language we're talking about after all. :)

The 2:1:1 rule has quite a number of exceptions (plus differences between BrE and AmE of course), but I always find it helpful to have some kind of rule that could be used with some consistency.

The source is obviously AmE (Romalda Spalding, a real pioneer in teaching spelling in North America).

dis'pel - dis'pelling (in
>both BrEng and AmEng), for example

the exception being?

traveling

and here's some more info to the topic: with verbs ending in '-ic', you add 'k' before adding the final '-ing' or '-ed', eg panic - panicking/panicked