Once upon a time, there were four people;

Their names were Everybody, Somebody, Nobody and Anybody. Whenever there was an important job to be done, Everybody was sure that Somebody would do it.

曾经有四个人。他们的名字分别叫人人、某人、无人、任何人。每当有重要的工作要做的时候，人人都以为某人会做。

Anybody could have done it, but Nobody did it. When Nobody did it, Everybody got angry because it was Everybody's job.

任何人都能够做，但是却无人做。当无人做时，人人都感到恼火，因为这是人人的工作。

Everybody thought that Somebody would do it, but Nobody realized that Nobody would do it. So consequently Everybody blamed Somebody when Nobody did what Anybody could have done in the first place.

人人都认为某人会做，但无人意识到无人做，结果，当无人做任何人都能做而未做的事的时候，人人都责怪某人。

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P.S. This article is like a twister. It's good material for students to learn the use of these several words!