高二英语必修五unit1语法总结(共5页).doc

精选优质文档-倾情为你奉上 Unit 1 语法重点 非谓语动词：to do/doing 一、动词不定式 不定式可以用来做主语、表语、定语、状语、宾语、独立成分，表示比较具体的意义。（1）做主语 动词不定式短语To master a foreign language is no easy job.To see this film is to waste time.To solve this problem is out of the question 为平衡整个句子，避免头重脚轻，常用it做形式主语，而将真正主语不定式放后面，用于这种形式是一些特定的结构。例如：1）谓语部分是系表结构，表语是某些形容词或名词。例如：It is foolish to do in this way.It sounds reasonable to do it this way.2）某些动词做谓语时。例如：It took much time to do th