文档介绍：Grammar and usage Grammar and usage 什么是非谓语动词? 非谓语动词的三种形式表示被动的动作动词-ed 表示主动的动作动词- ing 表示未发生的或后发生的动作动词不定式非谓语动词在句子中的作用 1作主语☆动词不定式作主语 To see is to believe. To recover lost time is impossible. It is / was + adj. + (for / of sb.) to do sth . It is impossible to cove lost time. It is very friendly of you to invite us to your birthday party. 单个不定式作主语时,谓语动词用单数若不定式太长,往往用 it作形式主语, 不定式置后 Be careful! ☆动名词作主语 Fighting broke out between the South and the North. It is / was +(no) adj. +doing sth . . It ’ s no use learning lots of words without knowing how to use them. But: It is not useful / good to do sth . It is use / good for sb. to do sth . 动词不定式作主语和动名词作主语的区别: 不定式作主语常表示具体的某一动作;动名词作主语表示泛指或一般的抽象概念在 there / it+be +no use / good /help / need 之后常用动名词作主语不定式可以和 when / where /how / what / whether 等连用,在句中作主语、宾语和表语,而动名词则不能高考链接: _______ is a good form of exercise for both young and old. A. The walk B. Walking C. To walk D. Walk