うん/うーん

 1 同意を表すとき使う。(会話5)(会話15)
    Used to show one's agreement.

 2 あいづちのとき使う。(会話12)(会話15)
    Used to indicate that one is listening.

 3 考えていることを表すとき使う(「うーん」)。(会話3)(会話6)(会話7)(会話10)(会話14)
    Used to indicate that one can't quite figure out the answer and is thinking about it.