高中英语题（关于状语从句）
请将下列英语短文中的状语从句找出来,并注明为何种状语从句.      A great French writer has said that we should help everyone as much as we can because we often need help ourselves.The small even can help the great.About this,he told the following story.      An ant was drinking at a small river and fell in.She tried her best to reach the side,but she could not move at all.The poor ant got too tired but was stiil doing her best  when a big bird saw her.With a pity,the bird thew a piece of wood.With it the ant reached the bank again.While she was resting and drying herself in grass she heard a man coming up.He was walking without shoes on his feet and carrying a gun in his hand.As soon as he saw the bird,he wished to kill her,and he would certaintly do so,but the ant bit him in one of his feet and at that moment the bird flew away at once.It was an animal much weaker and smaller than the bird herself that had saved her life.