1. ((接続助詞))
  1. 1〔…と反対に〕though; although; in spite of
    • そんなに金持ちでもないのに,自動車を3台持っている
    • Though [Although] he is not so rich, he owns three cars.
    • あんなに努力したのに,事態は好転しなかった
    • In spite of [For] all their efforts, the situation did not improve.
  1. 2〔…と比べ〕while; when
    • 父は背が低いのに母は高い
    • My mother is tall, while my father is short.
    • 皆が働いているのに,どうして遊びに行ける
    • How can I go and have fun when everybody else is working?
  1. 3〔…のために〕to ((do));for
    • 火をおこすのにマッチを用いる
    • We use a match to start a fire.
    • 料理をするのに水が必要だ
    • Water is needed for cooking.
  1. ((終助詞))
    • 出て行けばいいのに
    • I wish he would go.
    • もう少し注意すればよかったのに
    • You should [ought to] have been more careful.