The mother thought for a moment and said,"Let me tell you a story.One morning a man was walking down a beach （that引导定语从句）that was covered with dying starfish.The tide the night before had washed up thousands of starfish on shore.The man shook his head and thought it was a pity that all the starfish would die on the beach.Then he saw a boy （后面定语从句）who was throwing the starfish back into the ocean one by one as fast as he could.‘Son,'the man said,‘you'd better quit.There are thousands of them and you can't make any difference.'The boy didn't even pause in what he was doing and said,‘I can make a difference to this one,and this one,and this one.”
The next day,Tyler told the story to his classmates.They decided together that even the smallest things they did （they did是省略that的定语从句，修饰thing）could add up to mean a lot to the earth.So they each wrote down one thing（后面是省略that的定从，修饰thing） they could do to protect the earth,"I will walk to work."“I will use both sides of my paper.""I will plant a tree every year.”..
After school,Tyler smiled allthe way home,thinking of the difference （省略that的定从）they would make to the mother earth.
只是几个定语从句，给你标了下。
母亲想了一会儿,说:“让我告诉你一个故事。一天早晨，一个人正沿着海滩散步，上面布满了垂死的海星。前一晚的潮水将成千上万的海星冲上岸边。那人摇了摇头，觉得很遗憾，所有的海星都要死在了海滩上了。接着他看到一个男孩，他正尽可能快地将海星一个接一个扔回大海。“孩子，”那人说，“你最好停下来。”成千上万呢，你不能改变什么。男孩甚至都没有停下他正在做的事情，他说，“我可以改变这个，这个，还有这个。”
第二天，泰勒把这个故事告诉了他的同学们。他们共同决定，即使是他们所做的最微不足道的事情，加在一起，对地球也会意味很多。因此，他们各自写下了一件可以保护地球的事情，“我会走路上学。”“我要用纸的两面。”“我每年都要种一棵树。”
放学后，泰勒在回家的路上微笑着，想着他们会给地球母亲带来的变化。
