同位语从句是什么?怎么判断同位语从句?同位语从句应该怎么使用?同位语从句是英语中一种比较常见的从句。以下内容介绍了同位语从句的概念，以及同位语从句的判断方法，希望能为同学们的同位语学习提供帮助。更多有关同位语从句的内容，尽在新东方在线雅思网。

　　同位语从句介绍：

　　同位语的定义

　　所谓同位语，通常是指放在一个名词(组)后面起补充解释与说明作用的名词(组)(或相当于名词的词或结构)，同位语的句法功能与语义关系等同或基本等同于前面的名词(组)。其中，相当于名词词组的词或结构通常包括代词、动名词词组、动词不定式、名词性从句(即同位语从句)等。下面列举几个同位语的例句，供考生体会。

　　1. John Smith, the Nobel Prize winner, is an English. (名词词组做同位语)

　　2. John Smith and David Smith both come from the States. (代词做同位语)

　　3. John Smith loves his job, teaching English. (动名词词组做同位语)

　　4. During all those years the young man had but one aim—to fight for the independence of his motherland. (动词不定式做同位语)

　　5. John Smith has no idea which color is suitable for him. (从句做同位语)

　　同位语从句信号词：

　　提示同位语出现的“信号”

　　考生们除了需要知道同位语的定义之外，还要了解和熟悉提示同位语出现的“信号”。这些“信号”既包括标点符号，也包括一些提示性词汇，熟悉这些“信号”有助于考生在阅读过程中对同位语作出迅速反应和判断。当看到提示性的“信号”时，考生可分析一下“信号”后面的成分是否用于解释、说明前面的一个词(组)，如果是，即可将该成分判断为同位语。下面笔者列出提示同位语出现的几种“信号”，并举相应的例子供考生参考。

　　1.逗号“,”

　　例：Yet the Russian director Andrei Tarkovsky, one of the greatest of all film artists, described the film as a “work of genius.”

　　2.单个破折号“—”

　　例：Or it might have developed like television—as a strange, noisy transfer of music, information and narrative.

　　3.两个破折号，一前一后“...—...—...”

　　例：American imagery—the cars, the cities, the cowboys—became the primary imagery of film.

　　4.冒号“：”

　　例：The numeration system of the Tsimshian language (蒂姆西亚语) in British Columbia contains seven distinct sets of words for numbers according to the class of the item being counted: for counting flat objects and animals, for round objects and time, for people, for long objects and trees, for canoes, for measures, and for counting when no particular object is being numerated.

　　5.括号“()”

　　例：What is more, some of the treated animals survived longer than the oldest-living animals in the control group, which means that the maximum lifespan (the oldest attainable age), not merely the normal lifespan, increased.

　　6.引导词(如or、that is to say、that is、in other words等)

　　例：We—that is to say my wife and I—will be attending the wedding.

　　同位语从句的判断方法：

　　在复合句主句中名词性成分之后，与该名词性成分并列，补充说明该名词性成分有关情况的从句，被称为同位语从句。

　　同位语从句的先行词通常为answer, hope, fact, truth, belief, news, idea, promise, information, conclusion, order, suggestion, problem, question, thought, report, decision, doubt, opinion, theory等抽象名词。

　　例：The news that he will come here makes us happy.他要来这里的消息使我们开心。

　　关于同位语从句，以下几点需要特别注意：

　　1.它有时可以不紧跟在所说明的名词后，而是被别的词隔开，叫分隔式同位语从句。

　　2.它之前的名词通常用单数形式，且往往带有限定词(word除外)。

　　例：Where did you get the news that he could not come?你从哪儿听说他不能来?

　　3.引导同位语从句的词通常有连接代词(that, who, whether)、连接副词(how, when, where)等。

　　以上就是新东方新东方在线的小编为大家带来的有关“同位语从句是什么?怎么判断同位语从句?”的内容。同位语从句并不难判断，同学们只要掌握了相关规律，就很容易判断出同位语从句了。祝大家学习顺利!