1 在定语从句中，被修饰的名词或代词称为先行词；引导定语从句的连接词称为关系词, 其中that、which、who称为关系代词,where、when、how,why称为关系副词 2. 关系代词who、whom 和whose指人,分别在从句中作主语、宾语和定语。

which指物that多指物, 有时也指人,它们在从句中可以作主语或宾语。

定语从句中关系代词作从句宾语时可以省略。

This is the thief (that/who/whom) we have been looking for these days. (这个就是我们近日一直在找的小偷。

) Please find a room which is big enough for all of us to live in. (请找一间足够大能住下我们全体的房间。

) 3. 关系代词as such + n + as … the same +n+ as …指物或整个句子. These houses are sold at such a low price as people expected. He is not the same man as he was (像 … 一样的；像 … 之类；和 … 一样) 4. 关系副词。

when或where引导定语从句时,它们在从句中分别作时间状语和地点状语。

This is the room where they had a quarrel a week ago. (这是一个星期前他们吵架的房间。

) I can never forget the day when I first saw you. (我永远不会忘记第一次见到你的日子。

) why 表示原因。

在从句中用作原因状语。

The reason why she is absent from school is that she was ill. how 表示方式。

在从句中用作方式状语。

Please tell me the way how you have learned English so well.(请告诉我你的英语是怎样学得这么好的方法)你好，lcdyoshida！满意吗？如果不满意可以追问。

满意的话请采纳。