定语从句是高考重要考点之一，而其中分隔性定语从句在内容上理解难度较大，主要原因在于高考越来越注重对考生语言运用能力的考查，创新力度较大，命题者在设计题干时力求通过一两句话创设一个语言环境来考查考生的情景运用能力，在句中使用插入语进行隔离修饰这种常见的语言现象，以使句子保持平衡，增强语言的灵活性。含定语从句的题干加入插入成分后，打破了句子的正常结构，干扰了考生的正常解题思路。以致他们往往不能准确而又迅速地辨识句子的整体结构，分不清哪些是解题的有效信息，哪些是干扰的冗余信息。所以，解这类题时，应注意识别句子主干，删繁就简，去伪存真，排除插入语的干扰，充分利用有效信息。
现结合这几年高考单选题中分隔式定语从句设置的形式和种类归纳分析如下，以让大家了解一下其特点，从而掌握一些解题的方法技巧。
一、在定语从句中，因从句过长，为使句子保持平衡，而将定语从句和所修饰的先行词分开。先行词和定语从句被副词短语或介词短语等其它成分隔开，例：
1、The film brought the hours back to me____ I was taken good care of in that faraway village. A. until B. that C. which D. when
简析：去掉隔开先行词的插入语back to me，就会发现这道题不过是考查以时间the hours为先行词的最基本的用关系副词when 引导的限制性定语从句，从而可以轻易选择出答案C。
2、It was an exciting moment for the football fans this year, _____ for the first time in years their team won the World Cup. A. that B. while C. which D. when
简析：删除介词短语for the first time in years,可见这道题是以上面例1所提及的设置形式设计的，所不同的是本题是由关系副词when引导的非限制性定语从句修饰先行词an exciting moment,答案应是D。
二、在定语从句中，使用一个插入短语为语言的灵活性润色。虽然通常这个短语与句子的关系不是密不可分，但对句子的表达起到了修饰、缓和语气，表示程度等作用，进而使语言表达更加灵活。例：
3、Dorothy was always speaking highly of her role in the play, ____, of course, make the others unhappy. A. who B. which C. this D. what
4、The Chinese government has decided to developed the west of China, _____, I dare say, will benefit the people there, especially those who are still leading a poor life.A. what B. whatever C. which D. as
简析：分别删去of course和I dare say这两个插入短语就会发现这两道题不过是考查非限制性定语从句，可分别轻易选B和C。三、定语从句和插入语的混合使用，使主句变得更加复杂，迷惑性更大。
5、The repair work of Angkor Wat _____ would last at least ten years was completed with in eight years. A. which people supposed B. which people supposed it C. which people supposed that is D. people supposed that
简析：本题考查定语从句引导词和插入语的混合使用。在定语从句的关系代词和谓语动词之间加入插入语people supposed，而B和C分别多了that is 和it,故正确答案为A。
四、利用反语序，在定语从句中插入一个句子。将本来可以用正常语序表达的内容，从中间断开，然后将后半段提到前面。这种命题方式既突出了语言交际的特点，又增强了命题的隐蔽性。
6、Now children like to go to the fast food restaurant, as the name says, ____ eating doesn’t take much time. A. which B. that C. what D. where
简析：根据句意，还原句子的正常语序即把插入句as the name says放后，可知本题是以地点the fast food restaurant为先行词，应选D. where这一关系副词来引导非限制性定语从句。 总之，定语从句中隔离修饰这一语言现象虽迷惑性大，较难把握，但是掌握了一些这方面的知识就可以删繁就简，去伪存真，还其本来面目，抓住句子主干提高作答的速度，确保作答的正确率。
语法角度小结分隔式定语从句：
定语从句通常是紧跟在其先行词之后。但有时定语从句会与其先行词分开。分开的原因有可能是定语从句与先行词之间隔了另一个定语，或隔了一个状语。也可能是把修饰主语的定语从句移到谓语后，拉近主语与谓语的距离，使句子的主语读起来不会太长。
1) 定语从句与先行词之间插入另一个定语
There are no places left on the earth that the foot of man has not trodden. 地球上已没有人类还没有到达过的地方. (定语从句修饰 place)
The project sponsor is a senior executive in a corporation who is responsible to the business for the success of the project. 项目发起人是公司里在项目的成功方面对生意负责的一位高级的执行董事。 (定语从句修饰 executive)
2) 定语从句与先行词之间插入状语
I saw something in the paper which might interest you. 我在纸上看见了一些可能让你感兴趣的东西。 (which might interest you 修饰 something)
They remember a time in England when people were not as tolerant of each other's ideas as they are now. 他们记得在英格兰有一段时间人们不容纳其他人的观点。
3) 修饰主语的定语从句移到谓语后边
The day will come when man can make full use of solar energy. 人类充分利用太阳能的日子将会到来. (定语从句修饰 the day)
Without electronics, it would be impossible for the wonderful computers to be built which have brought about such big advances in modern technology. 没有电子学,就不可能制造出带来现代技术巨大进步奇异的计算机. (定语从句修饰 computers)
However, something can happen that completely changes the atmosphere. 然而，也可能发生一些事情可以完全改变谈话气氛。 （定语从句修饰something）