同位语八旬和定语从旬在英语中大量出现，是重要的两部分不相同的语法知识。然而由于它们的认句结构起到了限定、修饰补充说明的作用，特别是两种从句的引导同很相似这二点，常常使学习英语的人们难以确定，误把同位语从句看作是定语从句。实际上这两种从句具有明显的区别，我 Parotids Baptism and attributive from a large number of emerging in English, is an important part of the two different grammatical knowledge. However, due to their limited recognition of the sentence structure, the role of the modification of the supplementary explanation, and especially the fact that the guidance of the two clauses are very similar, often makes it difficult for those who learn English to determine the erroneous cognate clause by mistake . In fact there is a clear difference between these two clauses, me