Better communication, less frustration for both of you. Your child is likely becoming a much better listener and responding more readily when spoken to. It’s not just that his sentences are getting longer and more complex; he can follow directions with more than one step, for example, and he can describe a sequence of events in relative order. He’s even beginning to think out loud and talk through situations and feelings.
“Caring for Your Baby and Young Child, Birth to Age 5 (5th Ed)” by the American Academy of Pediatrics.