I would like to know a clear rule about when should I use double consonant.
For example: intelligent (yes), little (yes), collapse (yes), elegant (no).
Not just about double
l, but in general, is there any rule for double consonants?
English Language Learners Stack Exchange is a question and answer site for speakers of other languages learning English. It only takes a minute to sign up.Sign up to join this community
There are some languages that have very clear, consistent rules about how words are spelled, and how that spelling translates into pronunciation. Unfortunately, English is not one of those languages.
English started as a Germanic language, but was then heavily influenced by French (and thus Latin), apparently due to the Norman Conquests. Since then, a variety of other languages have had varying degrees of influence on English. Thus, English is a mixture of many different standards, making it inconsistent.
That's vocabulary. There are no rules for that.
When you double consonants, it applies in general for -ing forms, comparative & superlative adjectives & past simple with regular verb forms.
It's like asking: why travelling and not traveling? Because BrE use the former and AmE the latter. It's just vocabulary.