关于 what 复合关系代词的用法，下面再举几例，请试着翻译一下：
1. The old man lived in what was called a small forest.
2. What surprised me most was his good memory.
3. What's in the box is a big jar, and what's in the jar is a kind of wine.
4. Being determined is a kind of quality and that's what it takes to do anything properly.
那么如何区别what是“表疑问的连接代词”，还是“没有疑问的复合关系代词”呢？这里有一个规律可以参考：一般说来，what 引导的句子如果跟“疑问，询问，怀疑，质疑，好奇，不知道，想知道，不清楚，不明白，不理解，不确定，悬而未决”等意义的动词连用时，那么，what往往就是“疑问代词”。反之，则是复合关系代词。试比较：
What we will do hasn't been decided. 我们将要做什么还没有决定。（what是表疑问的连接代词）
What we will do is of great importance. 我们将要做的事情是非常重要的。（what是没有疑问的复合不定代词）