To be totally clear: kids learn all the grammar on their own from the examples. This whole concept is called "exemplar theory" https://en.wikipedia.org/wiki/Exe

To be totally clear: kids learn all the grammar on their own from the examples. This whole concept is called "exemplar theory" https://en.wikipedia.org/wiki/Exemplar_theory https://en.wikipedia.org/wiki/Exemplar_theory Before the kids are taught to explicitly discuss linguistic concepts like grammar, they already have the full grammar learned in their head. Furthermore, some of what they are taught is actually wrong because it's basically invalid hypotheses that people came up with when trying to describe the grammar. This is not to say that explicit study of grammar isn't interesting or useful. But it's not how you best learn language, and it's certainly far more biased to teach from a grammar-principles-first approach than to teach by just learning examples and letting your brain do its natural statistical learning process.