 Music. So in the same way that we don't speak to kids in one syllable words, you're not like, okay, until you're eight years old, we're only going to use the word I, me, you know, you just speak the full vocabulary. They get it. They don't know what it means to conjugate a verb, but they conjugate every verb perfectly. So they internalize the rules of grammar, even though they don't know what the word grammar means.