在考研英语中，各种从句相关知识点始终是考试的一个高频考点。今天，北外网课（北京外国语大学网络课程）老师就梳理了其中非常重要的一种——同位语从句的相关知识点，赶快来看看吧。
在同位语从句中，appeal,belief, conclusion, condition, conviction, doubt, evidence, fact, fear,feeling, ground(s),hope, idea, likelihood, message, news, opinion, order, plan,point, possibility, problem, promise,reply, proof, proposal, question, rumor,sign, story, suggestion, suspicion, theory, thought, truth, trouble,understanding, worry等名词，多用作同位语先行词。
如： I have no doubtthat he will overcome all his difficulties.
One sign thatyou are making progress in an art such as painting or photography is that youbegin to realize how much there is to learn.
此外，同位语从句的引导词通常为that, 但有时也可由whether及why, when,where,how引导。that不表示任何意义，其他词表示时间、地点、原因等含义。
如： The problem, whereI will have my college education, at home or abroad, remains untouched. Thefact that she was a few minutes late is no reason for discharging her.
同位语从句有时与并不一定与先行词相邻，也可能被隔开。
如：Evidence came upthat specific speech sounds a re recognized by babies as young as 6 months old.
此外，要多注意区分同位语从句与定语从句，注意总结二者的区别：从意义上看，同位语从句说明名词的具体内容，定语从句则对名词进行限定、修饰；从结构上看，同位语从句的引导词不在从句中充当任何语法成分，定语从句的引导词在从句中必须充当一定的句子成分；从先行词的词义特点看，同位语从句的先行词表达的是抽象内容，这类词数量有限，而定语从句的先行词没有任何限制。
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