要完整地理解无主句，必须弄清楚祈使句、省略句等易于混淆的概念。

To comprehend this sentence pattern perfectly, one should have a clear demarkation among the easily confusing conceptions of imperative sentence, elliptic sentence and so on.

动词短语省略句自上个世纪七十年代以来，一直都是生成语法学中研究的热点问题。

VP ellipsis in Chinese came to be discussed in the latest thirty years and many researches have studied on this topic.

对话是口语语篇最基本的形式，口语语篇中的情境省略句主要体现在对话中。

Dialogue is the basic form of the text of colloquial language and elliptical sentences with the language situation left out is mainly seen in dialogue.