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定语从句 ● 关系词的意义及作用 :定语从句一般都紧跟在它所修饰名词后面，所以如果在名词或代词后面出现一个从句，根据它与前面名词或代词的逻辑关系来判断是否是定语从句。被定语从句所修饰的名词或代词叫做“先行词”。引导定语从句的词叫“关系词”。关系词有两个作用：一、引导定语从句。二、代替先行词在其引导的定语从句中充当一定的句子成分。理解和牢记这两条概念，弄清楚关系词在定语从句充当什么成分，是掌握定语从句的关键。● 关系词的选用与判断 : 关系词 主语 宾语 表语 定语 状语 that 人 / 物 人 / 物 √ × × which 物 物 × × ×who 人 × × × ×whom × 人 × × ×whose × × × 人 / 物 ×when × × × × √where × × × × √why × × × × √as 主要用于非限制性的定语从句和 such…as, the same…as, as…as, 结构中。二、关系词的选用1. 先行词为 all,everything,nothing 等不定代词，代替物时，定语从句 that 用引导。注： something 后一般用 which 。Is there anything that you want to explain?In 1898 they declared that they believed there was something in nature which gave out radiation.2. 先行词前有形容词最高级、序数词或 only,very,none,no,little,few,much 等修饰时定语从句用that 引导。This is the only reason that I can say.This is the first step that can be taken.It is the best one that you may choose.3.way 后面的定语从句，引导定语从句有三种情况：a. 在比较正式的文体中用 in which ；b. 一般情况下用 that ；c. In which 和 that 省去。a.I was struck by the beauty of the way in which she stood.It was clear that the speaker now trusted Tom from the way in which these words were said.b. Lincoin asked the people to think of slavery in the way that these men did.Mary, there is one way that you could stop others talking about you and criticizing you.c.That’s the way I looked at it.The assistant who served her did not like the way she wasdressed.4. 先行词是表示地点的名词时（ country, school, roo...