1.who引导
Our guide，who was a French Canadian，was an excellent cook.
我们的向导，一个法裔加拿大人，是一位优秀的厨师。
2.whom引导
关系代词whom用于指人，在句中作动词宾语和介词宾语，作介词宾语时，介词可位于句首。
如：Peter, whom you met in London, is now back in Paris.彼得现在回巴黎了，你在伦敦见过他。
3.whose引导
whose是关系代词who的所有格形式，在从句中作定语。whose通常指人，也可指动物或无生命的事物。
如：The boy, whose father is an engineer, studies very hard.
4.which引导
关系代词which在非限制性定语从句，中所指代和修饰的可以是主句中的名词、形容词、短语、其他从句或整个主句，在从句中作主语、动词宾语、介词宾语或表语。
（1）which指代主句中的名词，被指代的名词包括表示物、婴儿或动物的名词、表示单数意义的集体名词以及表示职业、品格等的名词。
如：These apple trees，which I planted three years ago，have not borne any fruit.
（2）which指代主句中的形容词。
如：She was very patient towards the children，which her husband seldom was.她对孩子们很耐心，她丈夫却很少这样。
（3）which指代主句中的某个从句。
如：He said that he had never seen her before，which was not true.他说以前从没见过她，这不是真的。
（4）which指代整个主句。
如：In the presence of so many people he was little tense, which was understandable.在那么多人面前他有点紧张，这是可以理解的。
5.when引导
关系副词when在非限制性定语从句中作时间状语，指代主句中表示时间的词语。
如：He will put off the picnic until May 1st, when he will be free.他将把郊游推迟到5月1号，那时他将有空。
6.where引导
副词where在非限制性定语从句中作地点状语，指代主句中表示地点的词语。
如：They went to London，where they lived for six months.他们去了伦敦，在那儿呆了六个月的时间。
7.as引导
as引出非限定性定语从句时，代替整个主句，对其进行说明但通常用于像as we all know, as it is known, as is known to all, as it is, as is said above, as always mentioned above, as is usual, as is often the case, as is reported in the newspaper等句式中。as在非限定性定语从句中作主语、宾语，且引出的从句位置比较灵活，可位于句首或句末，也可置于主句中间。通常均由逗号将其与主句隔开。as有“正如……， 就像……”之意。
