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why引导定语从句例句
定语从句（也称关系从句、形容词性从句），是指一类由关系词引导的从句，因为这类从句的句法功能多是做定语，所以曾被称为定语从句，这类从句除了可以做定语之外，还可以充当状语等其他成分，所以现代语言学多使用“关系从句”这一术语。下面是小编为大家整理的why引导定语从句例句，欢迎阅读！
when，where，why作为定语从句的引导词，总称为关系副词。下面用句子合并的方法分析它们的使用。
一、where引导的定语从句
请分析下面两个简单句：
句①I know a garden.
句②You can find wild strawberries there.
把句②变为句①的定语从句，句①中的agarden做定语从句的先行词。在句②中there指句①中提到的agarden也就是定语从句的先行词，there在句中做地点状语，因此要用where引导定语从句，代替句②中的there，也就是说there就不能出现在定语从句中了。由此得到句③I know a garden where you can find wild strawberries.
句②还可以写作句④You can find wild strawberries in it(it指句①中的garden，“在花园中”要使用介词短语in the garden)。把句④变为句①的定语从句，因为it做介词in的宾语，先行词是agarden，指物。在这种定语从句中介词常常提到定语从句的开始，这时关系代词只能使用which替代it，it就不能在定语从句中出现了。由此得到句⑤即：I know a garden in which you can find wild strawberries.
请把下面每组的两句话合并为一句，把第二句话变为第一句的定语从句。
第一组：
This is the village.
I was born there.
→This is the village where I was born.
第二组：
The lab is not far from here.
The chemist often does experiments there.
→The lab where the chemist often does experiments is not far from here.
二、when引导的定语从句
请分析下面两个简单句：
句①We shall remember the days.
句②We studied together then.
把句②变为句①的定语从句，句①中的the days做定语从句的先行词。在句②中then指句①中提到的the days，也就是定语从句的先行词，then在句中做时间状语，因此要用when引导定语从句，代替句②中的then，也就是说then就不能出现在定语从句中了。由此得到句③We shall remember the days when we studied together.
句②还可以写作句④We studied together during the days.(介词短语during the days含义为“在这些日子里”)。把句④变为句①的定语从句，因为the days做介词during的宾语，先行词是the days，指物，在定语从句中介词during提前，用关系代词which替代the days，the days就不能在定语从句中出现了。由此得到句⑤We shall remember the days during which we studies together.
请把下面每组的两句话合并为一句，把第二句话变为第一句的定语从句。
第一组：
Ive always longed for the days.
I should be able to be independent then.
→Ive always longed for the days when I should be able to be independent.
第二组：
There are moments.
I forget all about it then.
→There are moments when I forget all about it.
三、why引导的定语从句
请分析下面两个简单句：
句①He wanted to know the reason.
句②I was late for the reason.
把句②变为句①的定语从句，句①中的the reasons做定语从句的先行词。因为the reason做介词for的宾语，先行词是the reason指物，在定语从句中介词for提前，用关系代词which替代the reason，the reason就不能在定语从句中出现了。由此得到句③He wanted to know the reason for which I was late.
注意：在定语从句中当先行词为the reason(s)，定语从句由for which引导时，可以用why代替for which。由此我们得到句⑤He wanted to know the reason why I was late.
请把下面两句话合并为一句，把第二句话变为第一句的定语从句。
The reason is not very convincing.
He came for the reason.
→The reason why he came is not very convincing.
The reason for which he came is not very convincing.
■巩固性练习
一、合并句子
请把下面每组的两句话合并为一句，把第二句话变为第一句的定语从句。
1.There came a day.The rain fell at last then.
2.This is the hour.The place is always full of women and children then.
3.We will start at the point.We left off there.
4.Give me one good reason.I should help you for the reason.
5.This is the factory.His father works there.
6.I dont know the reason.You quarreled with him.
7.Ill never forget the days.We studied together then.
二、链接高考
1.All___is needed is a supply of oil.
A.the thing B.that C.what D.which
2.Finally，the thief handed everything___he had stolen to the police.
A.which B.what C.whatever D.that
3.In fact the Swede did not understand the three questions____were asked in French.
A.where B.who C.in which D.which
4.Can you tell me the name of the factory___you visited last week？
A.what B.where C./ D.when
5.His parents wouldnt let him marry anyone___family was poor.
A.of whom B.whom C.of whose D.whose
6.After living in Paris for 50 years he returned to the small town____he grew up as a child.
A.which B.that C.where D.when
7.The film brought the hours back to me____I was taken good care of in that far-away village.
A.until B.that C.when D.where
参考答案
一、合并句子
1.There came a day when the rain fell at last.
2.This is the hour when the place is always full of women and children.
3.We will start at the point where we left off.
4.Give me one good reason why I should help you.
5.This is the factory where his father works.
6.I dont know the reason why you quarreled with him
7.Ill never forget the days when we studied together.
二、链接高考：1-5 BDDCD 6-7 CC
当使用why引导定语从句时，需要注意以下几个关键点：
1. 先行词限定
先行词必须是reason：why引导的定语从句中，其先行词通常且只能是reason，表示“原因”的名词。例如，“I dont know the reason why he looks unhappy today.”（我不知道他今天看上去不高兴的原因。）
2. 关系词作用
why作原因状语：在定语从句中，why作为关系副词，起到原因状语的作用，用于说明先行词reason的具体内容或原因。
3. 句式结构
定语从句结构：why引导的定语从句遵循“先行词（reason）+ why + 从句”的结构。从句部分是对先行词reason的具体说明或解释。
4. 替换与省略
可替换为for which：在某些情况下，why可以替换为for which，两者在定语从句中均表示原因状语。例如，“The reason, for which I come here is that I want to get your help.”（我来这里的原因是我想得到你的帮助。）
省略情况：在特定语境下，why引导的定语从句中的why有时可以省略，但这种情况较为少见，且需确保省略后句子意思仍然清晰。
5. 区分同位语从句
与同位语从句的区别：同位语从句用于解释说明前面的名词（如idea, fact, news等）的具体内容，而定语从句则是对先行词进行修饰限定。当why引导同位语从句时，其前面的名词通常带有“疑问概念”，且why不能省略。例如，“I have no idea why he was late for class.”（我不知道他为什么上课迟到。）这里的why引导的是同位语从句，解释说明no idea的内容。
6. 语义理解
理解定语从句的语义：在理解why引导的定语从句时，需要明确从句部分是对先行词reason的具体解释或说明，而非对reason的简单重复或无关描述。
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