Ellipsis and substitution are not only grammatical relations holding between linguistic forms, but also closely linked to information structure which is based on contexts.
省略和替代不仅是一般意义上的语法关系在语言形式中的体现，而且与以语境为特点的信息结构紧密相关。
Ellipsis is a very common grammatical phenomenon in English, especially in some particular situations.
省略是英语中常见的语法现象，且以特定语境下的省略居多。
And Huang Guowen classifies reference, substitution and ellipsis into grammatical cohesion, and the other two categories into lexical cohesion. This thesis adopts this classification.
黄国文把照应，替代和省略归为语法衔接，其它两类归为词汇衔接，本文即采用此种分类方法。
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