关系代词与关系副词的区分办法一般说来，当先行词是表示时间的名词时，其后要用关系副词when来引导定语从句；先行词是表示地点的名词时，其后要用关系副词where来引导定语从句。
但这只是一般情况，有时会有特殊情况噢！不信你看看下面的句子：The student (who answered the question) was John.student在从句中作主语,所以可用代词who来做关系代词The hotel (where we stayed) during our holidays stands by the seaside.hotel在从句中应该是作地点状语，是we stayed at the hotel.这个句子同时也能被写成：The hotel (which/that we stayed at) during our holidays stands by the seaside.这个时候从句有主语we，有谓语stayed at，独缺宾语hotel，所以要用关系代词which或thatDon’t forget the time that I’ve told you. 不要忘记我告诉你的时间。
This is the house that he bought yesterday. 这就是他昨天买的那座房子。
这两句均含有定语从句，它们所修饰的先行词分别为the time和the house，分别为表示时间和地点的名词，但为什么后面接的是关系代词that，而不是关系副词when和where呢？要弄清这个问题，我们先来回顾一下关系代词和关系副词的用法。
前面我们讲到，关系代词具有代词的功能，在定语从句中可用作主语或宾语等；而关系副词则具有副词的功能，它们在定语从句中只能用作状语。
所以，当我们要判断一个时间或地点名词后是用关系词that 还是关系副词when和where时，我们首先要明确关系词在定语从句是用作什么成分——用作主语或宾语，则用关系代词；用作状语，则用关系副词。
现在我们再来分析一下上面的两个句子：在Don’t forget the time that I’ve told you中，定语从句that I’ve told you之所以要用that 来引导，是因为从句中的动词told缺宾语，tell在此所用的句型是tell sb sth，所以定语从句要用关系代词引导。
在This is the house that he bought yesterday中，定语从句hat he bought yesterday之所以也要用that来引导，同时是因为从句中的动词bought缺宾语，所以定语从句也要用关系代词引导。
确定用关系代词还是用关系副词的简便方法是：看定语从句中是否缺少主语或宾语，若缺，用关系代词；若不缺，用关系副词。
练习1)This is the factory __ I visited last year.2)This is the factory __ I worked last year.A. whereB. whichC. asD. what【分析】以上两句只有细微的差别，但答案却不同。
1）选B；1）是动宾关系，即I visited the factory，因此选which。
2）选A。
做这种题时，要看先行词与定语从句中谓语动词之间的关系：2）中factory应在定语从句中作地点状语，即I worked in the factory，因此,选where。
3) I will never forget the day ___ wespent together.4) I will never forget the day ___ weworked together.A. whichB. whenC. whereD. what【分析】这两题的做法与上面的思路相同。
3) 选A；4) 选B，when 相当于on which。
5)Is this library __ you often read in?6)Is this the library __ you often read in?A.the oneB.in whichC.whereD.which【分析】5) 选A；5 )句的陈述句形式为This library is _____ you often read in. 此句缺先行词，需要加上，用the one替代the library，因此选A；6）选D。
做这种题时，应先把原句变为陈述句。
6）句的陈述句形式为：This is the library _____ you often read in.此题the library作in的宾语，故选D。
7) This is the reason __he was late.8) This is the reason _____ can explain his coming late.A. whichB. whyC. in whichD. on which【分析】7) 选B，why相当于for which，作原因状语。
8）选A，which在句中作主语。
9) He is such a good teacher ____ everyone respects and loves.10) He is such a good teacher __everyone respects and loves him.A. thatB. whomC. asD. who【分析】 9) 选C。
有such修饰的先行词，一般用as连接定语从句，译为“象……一样的”。
10）选A，为such … that“如此……以至于”结构。
11) _____ is known, light travels faster than sound.12) _____ is known that light travels faster than sound.13) _____ is known is that light travels faster than sound.A. AsB. WhichC. WhatD. It【分析】这几个题学生极易混。
11）选A；11）中As代表下文所表达的内容，即light travels faster than sound。
As所引导的定语从句可在句首、句中或句末，而which所引导的定语从句只可用于句中，故选As；12）选D；12）中It为形式主语，that所引导的从句是真正的主语，故选It；13）选C。
13）中是What引导的主语从句，且主句中缺少主语，因此用What来替代。
14) He tore up my photo, ______ made me upset.15) He tore up my photo and _______ made me upset.A. whichB. itC. whatD. where【分析】14) 选A，为非限制性定语从句，which代指He tore up my photo；15）选B，为and连接的并列句。
16) She is one of the students who _______ praised at the meeting yesterday.17) She is the only one of the students who _______ praised at the meeting yesterday.A. wasB. wereC. isD.【分析与比较】16）选B，who的先形词是the students，定语从句中谓语动词用复数；17）选A，who的先形词是the only one，定语从句中谓语动词用单数。
根据句意补全下列句子。
1. We will be shown around some places _____ visitors seldom go to.2. We will be shown around some places ______ visitors seldom go.3. I will never forget those years _____ I lived in the countryside with the farmers.4. I will never forget those years ______ I spent in the countryside with the farmers.5. There is no dictionary _____ you can find everything.6. There is no dictionary _____ can tell you everything.7. It is such a heavy stone _____ no one can lift.8. It is such a heavy stone _____ no one can lift it.9. Do you think the reason ______ he explained is believable?10. Do you think the reason ______ he was late is believable?11. ______ has been announced, we will have our final examination next month.12. He passed the examination, _______ made his parents very happy.1. which2. where3. when4. that5. where6. that7. as8. that9. which 10. why 11. As 12. which。