I．定语从句的特点与解题技巧：
1．特点：
① 定语从句都有先行词，即定语从句所修饰的词，有时充当先行词的是整个句子。
② 定语从句都有引导词（有时可以省略），即关系代词和关系副词。
③ 引导词代表先行词在定语从句中作一个成分（一般作主语、宾语、表语、定语或状语）
④ 限制性定语从句必不可少，而非限制性定语从句是对先行词的补充说明，可以省略，并与先行词用逗号隔开。
⑤ 定语从句一般紧跟先行词，有时因为句子结构关系在先行词与定语从句之间插入其他成分。
2. 解题技巧：
① 首先分析整个句子结构，判断所考查的是定语从句。
② 弄清引导词在定语从句中充当什么成分，根据充当的成分和先行词选择所用的关系代词。
作主语：指人用who或that; 指物用which或that。
作宾语：指人用whom、who或that（注：如果关系代词前有介词，只能用whom。） 指物用which，that（注：如果关系代词前有介词，只能用which。）
作定语： 用whose，of which.。
作时间状语：用when，in which，on which，during which等。
作地点状语：用where，on which， in which，in front of which, behind which，on top of which等。
作方式状语：先行词是the way时，用that，in which，或不填。
作原因状语：先行词是reason用why或for which 引导。
③ 如果句子复杂，不易理解，首先将作修饰语的成分和插入语去掉，再进行判断。
④ 注意：当关系代词在定语从句中作主语时，从句的谓语动词和先行词保持一致。
II．考点：
1．考查关系代词与关系副词：
当引导词在定语从句中作主语、宾语、表语和定语时， 只能用关系代词。当引导词在定语从句中作状语，表示时间、地点、原因、方式时，用关系副词或用介词加关系代词。
例如：
① I can never forget the days _____ we spent playing on the seaside all day long.
A．when B. on which C. that D. in which
分析本题发现，需要填的词是定语从句的引导词，在定语从句中作spent的宾语，只能选C.
② I can never forget the days ____ we stayed on the seaside playing all day long.
A. when B. which C. that D. on which
从本题中可以看出要填的关系代词在定语从句中做时间状语，所以选A.
2. 考查非限制性定语从句：尤其当先行词是前边整个句子时，此时关系代词可使用which和as。as引导的定语从句中可以放在主句之前、之后或插在主句中。which 不能放在句首，而as则可以；as有“正如”，“就像”之意，而which没有。例如：
① Our class didn’t win the football match, ______ made us very sad.
A. what B. which C. that D. it
此题应选A. which引导非限制性定语从句，先行词是前边整个句子 。此题不能选that和it，如果填that和it，逗号后就不是从句，而是一个完整的句子，这时就不能用逗号，而应该用句号或用and连接两个句子。
② _____ you can find by yourself, the rain is unlikely to stop now.
A. Which B. As C. What D. That
此题中要填的关系代词代表的是后面的整个句子，但不可以填A. 因为which引导非限制性定语从句不能放在句首，只能选B.
③ _____ is often said, having a walk after supper is good for your health.
A. It B. Which C. As D. That
此题考查as引导非限制性定语从句与形式主语句型的区别。可以看出两句中间是逗号，后面是主句，前边是从句，放在句首不能用which 引导非限制性定语从句，如果填It需要将逗号改为that，是形式主语句型。因此此句只能选C.
④ He was able to climb on the tall tree without help, _____ we didn’t expect.
A．which B. as C. that D. so
as引导非限制性定语从句，先行词是整个句子时，一般可以译为“正如，就像”，此题不可以译为“正如”，只能选A.
3. 下列情况只能用that不能用which引导定语从句。
①先行词为不定代词everything, anything, nothing, all等。例如：
There was a big fire last night and everything ____ he had was burnt up.
A. that B. which C. what D. in which
②先行词前有最高级、序数词及no, the only, the very, the last, 修饰时。
This is the only method _____ we can find to solve this problem.
A. that B. which C. what D. in which
③先行词中既有人又有物时。
Tough I have left New York so long, the people and things _____ I met with
are still familiar to me.
A. who B. which C. who and which D. that
④先行词是who和which时。
Who _____ you know would like to take part in this activity?
A. that B. who C. whom D. which
Which of the two girls ____ you come here with is your girlfriend?
A. whom B. who C. that D. which
4. 先行词前有the same 和 such 时。
① the same修饰先行词时用as或that引导定语从句。例如：
区别：Tom is using the same pen as I lost.
as表示“象”，即Tom正在用的笔跟我丢的笔样子一样，但不是同一支。
Tom is using the same pen that I lost.
that引导定语从句，意思是Tom正在用的笔就是我丢的那一支。
② such修饰先行词用as引导定语从句。例如：
These houses are sold at such a low price ___ people expected.
分析句子，空格后的从句缺少宾语，由此判断是定语从句，因先行词前有such故应填as。
比较：such……that……引导结果状语从句。例如：
These houses are sold at such a low price ____ people all expected to buy one.
分析句子，空格后的句子不缺少成分，由此所填的词不是定语从句的引导词，因此应填that引导结果状语从句。
5. 介词+关系代词引导的定语从句。
有时可以将介词放在关系代词之前。例如：
Please put the books on the desk on which there is a computer.
The man with whom I went to the park is my father.
当介词跟一些动词构成固定短语时，不可提到关系代词之前。例如：
This is the bike which I have been looking for.
look for是固定短语，不能拆开，因为拆开后意思就发生了变化
注意：关系代词that和who前不能加介词。
6. 名词、代词、数词+介词+关系代词引导定语从句。例如：
① I live in the house the windows of _____ face south.
A. it B. that C. which D. this
介词后只能用which，of which表示所属，the windows of which 可以换成
whose windows。
② Johnson has two girls both of _____study in Beijing University.
A. them B. that C. whom D. those
both of whom表示她们两个都……。
③ Our school has two thousand students, sixty percent of _____ are boys.
A. whom B. who C. them D. those
数词 + of + which/whom表示其中的多少。
7. 带有插入语的定语从句。
此时，可先将插入语排除掉，再分析定语从句。例如：
He doesn’t like this film, _______ very exciting and interesting.
A. which I think it
B. which I think it is
C. which I think is
D. I think which is
此题中，I think是插入语，可先将其去掉再考虑，应选C。
8. 分清定语从句与同位语从句：
定语从句和同位语从句都是对名词起限定作用。定语从句是对先行词的修饰限制，其引导词在从句中作成分；同位语从句是对先行词的解释说明，其引导词在从句中一般只起引导作用。例如：
Have you heard the news _____ about one thousand people died in an accident, ______ is quite shocking?
A. which; which B. which; that C. that; which D. that; that
此题中，第一空填that引导同位语从句，解释消息是什么。第二空which引导非限制性定语从句。
9. 定语从句与强调结构的考查相结合。
这时需要分清是强调结构还是定语从句。例如：
Was it in the supermarket ____ you bought your bike ____ you met your English teacher.?
A. that; where B. where; that C. in which; where D. which; that
分析句子，判断第一空引导的是定语从句，supermarket表示买车的地方， 应填where；第二空应填强调结构的引导词that。
10. 分清定语从句与状语从句：
You should make it a rule to leave things ___ you can find them again.
A. when B. where C. then D. there
分析句子，where此处引导的是状语从句，表示的是放东西的地方，而不是修饰things的定语从句，所以选B。
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