我不太清楚哪儿你能找到个好木工（carpenter）——你最好四处打听打听。（ask around）

I am not clear about where you can find a good carpenter, you had better ask around.

I am not sure where you are able to find a good carpenter, it is the best for you to ask around.

I have no idea about where you can get a good carpenter , you had better ask around

疑问词有两个作用：1 用于特殊疑问句。这时叫做疑问代词或疑问副词。2 引导名词性从句，这时的疑问词仍然保留疑问含义。为了区别于特殊疑问句的用法，有的语法书（主要是传统语法书）将引导名词性从句的疑问代词和疑问副词改称连接代词和连接副词。

但有的语法书没有改名称，认为疑问词可以引导二种不同的疑问句：直接疑问句（即特殊问句）和间接疑问句（即名词性从句）。在这两种问句中，疑问词的含义不变，都表示疑问。这就可以与特殊关系代词/特殊关系副词（又叫融合性关系代词/融合性关系副词fused relative words)相区别。后者如what=the thing(s) which, whatever=anything that, when=the time when, where=the place where. 这种wh-词没有疑问含义，是先行词和关系代词/关系副词融合为一体，它们引导的名词性从句相当于一个名词后接定语从句。

例如：

Where is he from? where为疑问副词。

I don't know where he is from. where为连接副词（有人还叫疑问副词）

This is where his brother was killed last year. where为特殊关系副词/融合性关系副词。where=the place where.