在名词性从句中，什么时候用连词，什么时候用连接代词或连接副词？以及定语从句中关系代词和关系副词？

这几个吧，你都需要先把句子还原，也就是拆成两个完整的句子，看看现在的句子里缺个什么，再确定它的成分，以选择适当的词。
例如，在这个句子里，Our teacher took us around his old house that he lived in ten years ago.=Our teacher took us around his old house in which he lived ten years ago.=Our teacher took us around his old house where he lived ten years ago.我们的老师领我们参观了他十年前住过的老房子。
把句子拆开，几个都是一样的：Our teacher took us around his old house 。He lived in that house ten years ago.
这些能理解吧，举了个例子，解释少些，不过如果不明白哪儿，再问，我解答到底，嘿嘿，但我只能以我的理解能力来答了

看关系词代替了先行词后 在从句中做的是什么成分，如果是状语，就用关系副词

去问自己的英语老师