For fluent speakers of a language, rules of the language such as how to create new words are often:

Question

Quizplus · Accepted Answer

Fluent speakers of a language often follow the rules of the language unconsciously, meaning they are not necessarily conscious of the rules, but they reliably follow them. This is evident in the fact that they are able to create new words and sentences that are consistent with the grammar and syntax of the language.

For Fluent Speakers of a Language, Rules of the Language