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。
2
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。
3
This essay mainly analyze the function of grammatical cohesion, such as reference, ellipsis and substitution, conjunction.