Certainly there must have been a subtle, perhaps intuitive teaching process that neither our parents nor we were aware of. We begin by imitating what we hear our parents say as best we can, repeating random phrases. As our speech improves, our parents respond more positively and less negatively. First, let's examine the assumption that children begin speaking by trying to repeat what they have heard their parents say. Daddy go 1b.
Daddy go is an attempt to express 'Daddy is going'.
Indeed, when parents do respond to speech errors, they most often respond positively. Here are a few advanced errors from the history of my family. In fact, parents themselves make grammatical errors when they speak. 1b above for a clue. In other words, the only way a child learning language could make such an error is that he or she is learning a rule that derives past tense verbs from verb stems.