Another great example of a rule that exists in English that native speakers generally follow without knowing, but is taught to learners of English as a second language, is the rule of which adjectives form comparatives and superlatives by suffixing '-er' and '-est', and which by prefixing 'more' and 'most'.
As a native English speaker I was never taught a rule that explains why I would say hotter or wrigglier or redder or wildest or shiniest, but more emphatic, more open, most excellent or most orange. I'd always assumed adjective -er and -est suffixes were just irregular, with no pattern to them at all.
But it turns out there's basically a simple rule - if it ends in '-y' or has only one syllable, you suffix it; otherwise you use the 'more' or 'most' form. It's remarkably solid as a rule, and even when I come up with a word that sounds sort of right to my ear that doesn't follow the rule - like, for example, I can kind of see 'wickedest' as being a valid form - it turns out that if I think about it, it probably doesn't sound right after all, and I would probably prefer 'most wicked'.
As a native English speaker I was never taught a rule that explains why I would say hotter or wrigglier or redder or wildest or shiniest, but more emphatic, more open, most excellent or most orange. I'd always assumed adjective -er and -est suffixes were just irregular, with no pattern to them at all.
But it turns out there's basically a simple rule - if it ends in '-y' or has only one syllable, you suffix it; otherwise you use the 'more' or 'most' form. It's remarkably solid as a rule, and even when I come up with a word that sounds sort of right to my ear that doesn't follow the rule - like, for example, I can kind of see 'wickedest' as being a valid form - it turns out that if I think about it, it probably doesn't sound right after all, and I would probably prefer 'most wicked'.