We were looking through Elaine's book of farm animals, and I was quizzing her on their sounds. "What's a cow say?" "What's a chicken say?" (She'll answer that one now.) "What's a sheep say?" But she stopped answering me, and, after a moment, started reciting a new word.

I don't think she knows quite what to do with it -- other than practice it --, but she figured out what the most important word in what I was saying was... It connects the animals to their sounds: "say."