知识点3：关系副词引导的定语从句

　　关系副词when, where, why可代替的先行词是时间、地点或理由的名词，在从句中作状语。

　　【考查点】关系副词when, where, why的含义相当于"介词+ which"结构，因此常常和"介词+ which"结构交替使用。

　　如： There are occasions when (on which) one must yield.

　　任何人都有不得不屈服的时候。

　　Beijing is the place where (in which) I was born.

　　北京是我的出生地。

　　Is this the reason why (for which) he refused our offer?

　　这就是他拒绝我们帮助他的理由吗？

知识点4：关系词的选择取决于从句中的谓语动词

　　1.【考查点】 用关系代词，还是关系副词完全取决于从句中的谓语动词。及物动词后面无宾语，就必须要求用关系代词；而不及物动词则要求用关系副词。

　　如： This is the mountain village where I stayed last year.

　　四、例题精析

　　【例题1】

　　【题干】Nearly all the streets are in straight lines, ________ from east to west. Those ________ run from north to south are called avenues.

　　A. running; that B. run; who C. running; who D. run; that

　　【答案】A

　　【解析】： 主语与run(延伸)是主动关系，所以用现在分词。Those指街道，所以不用

　　来引导定语从句。 who而用that

　　【题干】Is this research center ________ you visited the modern equipment last year?

　　A. where B. that C. the one that D. the one where

　　【答案】：D

　　【解析】：将疑问句改为陈述句：this research center is…显然缺少先行词，必须加上代词the one来作先行词，又因定语从句不缺主语或宾语，所以用关系副词where。假若在this后加the，就选where，请想想这是为什么。

　　【题 干】

　　The treatment will continue until the patient reaches the point ________ he can walk correctly and safely.

　　A. when B. where C. which D. whose

　　【答案】：B

　　【解析】 因为表示“阶段、程度、地步”的the point在定语从句中作地点状语，所以用语从句。 where引导定

　　【题干】

　　—How did you get in touch with the travel agent, Robin?

　　—Oh, that’s easy. I surfed the Internet and then called one ________ the telephone number is provided

　　A. which B. in which C. of which D. whose

　　【答案】：C 【解析】：因为of which引导定语从句，并在从句中作定语。of which the telephone number = whose telephone number。