专题06where引导的定语从句
【理论回顾】
1、where引导定语从句
  where可以引导___________________，也可以引导____________________。where的指示对象是表示_____的名词，在从句中作__________。
2、where 引导定语从句的几种情况
1. 先行词常常是表示地点的名词，并且在从句中作地点状语
例1：Stephen hawking believes that the earth is unlikely to be the only planet ___ life has developed gradually. 
A. that        B. where    C. which        D. whose
点评：先行词为planet，表示地点，从句中的动词develop为不及物动词,从句不缺少成分，故排除选项中的关系代词that, which, whose，选择where在从句中作状语。
例2 ：Some pre-school children go to a day-care center, _______ they learn simple games and songs. 
    A. then        B. there    C. while        D. where 
2. 一些抽象意义的模糊地点名词作先行词时，用where引导定语从句。这些抽象概念的单词常有：case（情况）/ condition(状况)/ point（阶段）/ position（处境）/ situation（情形）/ occasion(场合) / circumstances（境况）/ scene（情景，场面）等。
例1：Remember that the best relationship is one where your love for each other is greater than your need for each other.       
句意：请记住，最深的感情关系表现为彼此间的爱超过彼此间的需要。 
点评：这里where引导的定语从句修饰先行词one，也就是relationship (此处one指代的是relationship)。relationship不是地点名词，但此处却用了where来引导，where在这里表示“在这样的感情关系下”。从定语从句的结构来看，定语从句不缺主语和宾语，引导词where在从句中充当的是状语。
truncated 带where
例2：Cheating is most likely in situations _________ the vital interests are high and the chances of getting caught are low.
例3：Until such time as mankind has the sense to lower its population to the point __________ the planet can provide a comfortable support for all, people will have to accept more “unnatural food”.
3. 定语从句中关系副词where可以与“介词+which”形式互换
当先行词表示地点，定语从句中缺少地点状语时，通常用关系副词where引导，此时也可选用表示地点的介词＋which来代替关系副词where. 例如：
例1：I visited the village where many children couldn’t go to school because of poverty.
＝I visited the village in which many children couldn’t go to school because of poverty.
例2：July and August are the months when the weather is hot.
＝ _____________________________________________________
例3：Do you remember the place where we had lunch? 
＝  _____________________________________________________
【想一想】
在哪些情况下，关系副词不能与“介词+which”互换呢？
【练一练】
一、句型转换
1. The school which / that he once studied in is very famous.
________________________________________________________________
2. He left the room in which he lived last year.
________________________________________________________________
3. I know a wood where you can find roses．
________________________________________________________________
4. I'll never forget the day on which I joined the League．
________________________________________________________________
5. The earth on which we live is a planet．
________________________________________________________________
二、选择题
1. ---Can you believe I had to pay 30 dollars for a haircut ?

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