what(= the thing that/the things that所的事情)：

　　what we saw astonished us.相當于：

　　he things that we saw astonished us.

　　我們所看到的事使我們感到驚訝。

　　When she sees what you have done she will be furious.相當于：

　　When she sees the damage that you have done she will be furious.

　　她要是看到你造成的損壞，她會大發雷霆的。

　　請務必不要將關系代詞what與連接關系詞which混淆。記住，which必須用來指前面一個句子中的一個詞或一組詞。而

　　what不指前面的任何東西。再者，what常常是動詞的賓語，

　　然而which則常常是動詞的主語：

　　He said he had no money，which was not true.

　　他說他沒有錢，這不是實話。

　　Some of the roads were flooded，which made our journey more difficult.

　　一些道路被水淹了，這給我們的旅行造成了更多的麻煩。