英语非谓语动词的用法

动词不定式具有名词、形容词和副词的作用,它可以作主语、宾语、宾补和状语。(1)作主语动词不定式作主语时,常用it作形式主语,而将真正的主语放在句末,It＋be＋形容词＋(for sb)＋动词不定式。It's important (for us) to protect environment。(对我们来说)保护环境是很重要的。注：当在kind,good,nice,clever等表示人的品质的形容词后,不用for而用of。It's very kind of_you_to_help_me。你帮助我真是太好啦。It's very clever of_you_to_do_like_that。你那样做真是太聪明啦!(2)作宾语He wants to_go_out_with_her。注：①一些谓语动词后只能用不定式作宾语,常见的这类词表示命令、打算或希望,如：would like,want,wish,hope,decide,plan,expect等。Would you like to_see_a_film this evening?你今晚想去看电影吗?②在find,think后跟不定式作宾语时,常用it代替,而将真正的宾语放在句末。I find it easy to_read_English_every_day。我发现每天读英语很容易。(3)宾语补足语动词不定式作宾补时,它与宾语有逻辑上的主谓关系。Lucy asked him to_turn_down_the_radio。露西要他关小收音机。(4)作定语动词不定式作定语时,应放在名词之后,它与名词有逻辑上的动宾关系。I have a lot of homework to_do。我有许多家庭作业要做。There is nothing to_worry_about。没什么要担心的。(5)作状语Mrs Wang went to Shanghai to_see_her_daughter。(目的)王太太去上海看她女儿。We're glad to_meet_you here。(原因)我们很高兴在这见到你。He is too tired to_work_on。(结果)他太累了而不能继续工作。3．不定式的否定形式是在不定式前加not。They told us not_to_play basketball too long。他们告诉我们不要玩太长时间篮球。You'd better not_go_to_bed late。你最好不要睡觉太晚。4．不定式常和疑问词what,which,when,where,how连用,相当于一个宾语从句。The teacher is telling the students what_to_do。老师正告诉同学们做什么。He didn't know where_to_go。(where to go＝where he should go)他不知道去哪里