When Soren was two years old, I published a list including every word he could say by that age. I always intended to do something similar for Carl but keeping up with his incredible vocabulary was a Herculean task. He used some complete sentences by 15 months and could talk about everything in his experience by the time he was 18. It would probably be more appropriate for me to chart his grammatical development in the past few months but I don't know how. I also never noticed him making grammatical mistakes, not even the traditional "I/you" trouble. His speech certainly has become more complicated, with conjunctions, modifiers, and multiple clauses but I don't know how to document that. Let's just say: this boy can talk.