die    （動）死ぬ
  dead   （形）死の・死んでいる
  death  （名）死
  ＜動詞 die を用いた文＞
         He died ten years ago.

  ＜形容詞 dead を用いた文＞
         My grandfather is dead.

  私のおじいさんが死んで３年になります。
      My grandfather died three years ago.
      It is three years since my grandfather died.
      Three years have passed since my grandfather died.
      My grandfather has been dead for three years.