Not quite. Most parts of English fit neatly within the deep logic of natural languages our brains are wired for. The same can be said about all other natural la

Not quite. Most parts of English fit neatly within the deep logic of natural languages our brains are wired for. The same can be said about all other natural languages including Latin, which have very different grammar but they all compile the same. Pardon my bad, programming based, metaphors. However, many languages including English have parts that don't fit. They are rules introduced by fiat. Someone at some point decided that because you can't split infinitives in Latin, you shouldn't do it in English. But our brains are not wired for that. You can just willy-nilly mix C++ and Python. And here's where things get interesting, any native speaker will be fluent in the natural part of the language, but the rules introduced by fiat are often used to distinguish class and education. Children learn language simply by listening, but more then that our brains will auto complete! That's how pidgin languages turn into creole languages. This auto completion feature will lead children to naturally split infinitives in English. And equally naturally never split them if they are native speakers of Latin. Not splinting infinitives has to be learned in a separate process - school, and relies on a different part of the brain - long term memory. That's why it's used to show of class and education. English is not unique in mixing natural and fiat rules. Japanese for example has parts which are natural and honorific constructs introduced by fiat. People who left Japan as young children, can be fluent in Japanese and yet completely not know the honorific forms, which makes them sound very lacking even though they are fluent in Japanese.