・I do not want both books. 本は両方(は)いらない.　★この文は部分否定のほか全部否定も意味し, あいまい. 次のようにすればあいまいさはなくなる. I don't want either book. I want neither book. (全部否定). I want one of the books(, not both). (部分否定).