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定语从句的定义：在复合句中,修饰某一名词或代词的从句,称为________也叫形容词性从句
被从句所修饰的词称为__________   引导从句的词称为引导词或_________.
判断步骤：
（1）要判断出先行词
（2）要确定关系代词（即先行词）在从句中所担任的成分
（3）要确定关系代词的人称和数
注：定语从句的时态不受主句的限制
The girl who/that is from Canada is my new e-pal.
先行词  引导词
定语从句的分类：
（1）_____________：
与先行词关系密切，如果 没有定语从句，主句含混不清，不完整，限定性定语从句与先行词之间无逗号。
（2）_____________：
是先行词的一个附加语，对先行词起进一步说明作用，如果删掉它，主句的意义仍然是完整的，非限定性定语从句与先行词之间有句号。
如：
The man who/that came first is Mike.
His mother does morning exercises every day, which is good for her health.

关系词用法列表
关系词
先行词所指
关系词在句中作用

关系代词
who

that

whom

which

whose

关系副词
when

where

why

1）who（whom）that
Who指人=that，在从句担任主语，也可代替在从句中做宾语的whom，前面不能有介词。如有介词则必用whom（结构：介词+whom）。
例如：The girl who/that is standing there is Mary.
      She is the girl who/whom/that I met that day.
     The doctor to whom she sent her frirend  is very famous.
注：为以下情况时，who不与that通用
     a.先行词为one(s)/anyone/those时,用who.
     b.当先行词有较长定语时用who
        I met a foreigner in the street yesterday who could asked me questions in Chinese.
     c.一个句子中带有两个定语从句，其中一个定语从句的关系代词是 that另一个用who.
        The boy that you met last night is the group leader who studies very hard.
     d.在there be 开头的句中用who

(2)whose
    是代词的所有格，即可代人，又可代物。
    I saw a woman whose bag was stolen.
    Please show me the bag  whose=of which  cover is  red.  
3）which, that所代替的先行词是事物的名词或代词，在从句中可作主语、宾语等。在限定性定语从句中，which和that都指物时，可通用例如：The picture that/which was drawn by Tom was nice.

不通用的情况 只用WHICH
       1. _____________。
His mother does morning exercises every day, which is good for her health.
        2. ____________   Is this the library from which you borrow books?

只能用that
　　 a）　在there be 句型中，只用that，不用which。
　　 b）　在不定代词，如：anything, nothing, the one, all, much, few, any, little等作先行词时，只用that，不用which。
　　 c）　先行词有the only, the very修饰时，只用that。　
　　 d）　先行词为序数词、数词、形容词最高级时，只用that。.
　　 e）　先行词既有人，又有物时。例如：
f) 主句已有疑问词who或which时
g) 有两个定语从句,其中一个关系代词用which, 另一个用that
关系副词的用法：(一般情况)可以与介词+关系代词替换

1.where的用法：
     表……的地方，修饰场所、方位名词。 This is the house.  I was born in the house.

    =This is the house   where   I was born. =This is the house which I was born in.
                    先行词     关系副词
    =This is the house in which I was born.
   注：关系副词可等于”介词+关系副词“
2. when的用法：
    表……的时候，修饰日子年代等名词。 We will never forget the day when we joined the party.
3. why的用法：
    表……的原因，……的理由。 The reason why I called is to invite you to a party.
注：区分与关系代词的区别，只要在定语从句中担任状语的，就是关系副词。
that代替关系副词，可以用于表示时间、地点、方式、理由的名词后取代when, where, why和"介词+ which"引导的定语从句，在口语中that常被省略。