请帮我找出这篇英文作文错误或不顺的地方!

这个故事应该全部都是在过去式,如下
One day a boy NAMED Tony and his little sister Amy WENT fishing by the river. He promised Amy THAT he will catch a big fish for her. But he didn't catch any fish for four hours. He was very upset so he made a decision. He went to the fish market AND bought a big fish WHEN Amy went to the toilet. He quickly put the big fish on the fishing rod and then THREW it into the river. When Amy came back he excitedly SHOUTED and then PULLED up a bigfish. Amy was very amazed and excited AND PRAISED his brother Tony. They took a picture and amusedly HELD the fish AND went home.

One day a boy Tony and his little sister Amy go fishing by the river. He promised Amy he will catch a big fish for her. But (he) has not caught any fish for four fours. He was very upset(,) so he made...