为了让考研的同学更高效地复习考研英语，新东方在线考研频道整理了考研英语知识点背诵：定语从句省略，考研的同学可以了解一下，希望对大家有所帮助。
考研英语知识点背诵：定语从句省略
定语从句省略
①关系词充当从句宾语
关系词充当从句宾语时，可以直接省略，后面的从句没有形式的变化，因此会出现两个名词或一个名词一个代词连用在一起的情况。
例1：I know the boy who the teacher praised just now.
【解析】who在从句中充当praise的宾语，可以直接省略为 I know the boy the teacher praised just now。省略之后的句中可以看到the boy和the teacher两个名词连用。
例2：The police explained that the difficulties which they faced were too severe.
【解析】which在从句中充当face的宾语，可以直接省略为The police explained that the difficulties they faced were too severe.省略之后的句中可以看到the difficulties和they名词代词连用。
②关系词充当主语
关系词充当从句主语时，也可以省略，但后面的从句发生形式的变化，从句是主动语态，将动词变成-ing形式；从句为被动概念，将动词只保留过去分词。因此省略之后会出现 “名词+动词-ing/ed”结构。
例1：The first thing which is needed for innovation is a fascination with wonder.
【解析】which在从句中充当主语，可以省略，但后面的动词is needed是被动概念，要直接保留过去分词，为The first thing needed for innovation is a fascination with wonder。省略之后的句中可以看到“名词+动词过去分词”结构。
例2：Hamilton isn’t the only educator who crossed the Atlantic.
【解析】who在从句中充当主语，可以省略，但后面的动词crossed是主动概念，要改成-ing形式，为Hamilton isn’t the only educator crossing the Atlantic。省略之后的句中可以看到“名词+动词-ing”结构。
例3：Databases which are used by some companies don’t rely on data which are collected systematically.
【解析】此句中出现两处定语从句，而且which在从句中都充当主语，可以省略，后面的动词均为被动概念，要直接保留过去分词，为Databases used by some companies don’t rely on data collected systematically.
例4：Police hunting the killer of a part-time police officer stabbed outside her home in northwest London are seeking a man wearing a hooded top seen running away from the scene.
【解析】短短的一个句子里面含有四个分词作定语：hunting:现在分词，作后置定语，修饰police，与其构成主谓关系，即“搜捕凶手的警方”；stabbed:过去分词，作后置定语，修饰officer，与其构成动宾关系，即“被刺死的警察”；man后面有两个修饰，一个是wearing与其构成主谓关系，即“穿着带有帽兜上衣的男子”，一个是seen:与其构成动宾关系，即“有人看见该名男子”。
例5：Additional social stresses may also occur because of the population explosion or problems arising from mass migration movements.
【解析】这里现在分词arising from mass migration movements作定语修饰前面的名词，表示“大量人口流动造成的问题”。
例6：Over the past three decades the number of students leaving home each year to study abroad has grown at annual rate of 3.9 percent, form 800,000 in 1975 to 2.5 million in 2004.
【解析】这里出现 “名词+动词-ing”结构，因此是分词作定语，现在分词leaving home each year to study abroad作定语修饰前面的名词students，表示“每年去国外留学的学生”。
以上是新东方在线考研频道为考生整理的“考研英语知识点背诵：定语从句省略”相关内容，希望对大家有帮助，新东方在线考研频道小编预祝大家都能取得好成绩!更多英语复习相关信息尽在新东方在线考研英语频道。