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1、一.不定式做宾语:1.it作形式宾语:find(think,keep,make...)+it+adj.+(forsb)+todosth.动词不定式作宾语且过长时常用it作形式宾语，而让真正的宾语——不定式断后。例如：Themandownstairsfoundithardtofallasleep.2.不定式直接做动词宾语:want(forget,remember,like,love,hate,continue,begin,start,hope,wish....)+todosth.Iforgottoturnoffthelightslastnig
2、ht.二:不定式做主语:1.It做形式主语,不定式做真正的主语: 1)Itis(was)+adj.+(forsb)+todosth. It'sverydangerousforchildrentoplaywithfire. 2)Ittakes(took,willtake)sbsometime+todosth. Itwilltakemethreedaystofinishreadingthebook.2.不定式直接做主语:Toplayfootballinthestreetisverydangerousforchildren.三.不定式做表
3、语:Mydutyistolookafterthekidswell.四.不定式做定语:作定语时，不定式（短语）常置于被修饰的名词、不定代词等之后。例如：Ihave lotsofthingstodotoday.Wouldyouliketogivemesomethingtoeat?[提示]如果不定式（短语）是不及物动词，其后应有必要的介词/副词。例如：Ifoundaniceplaceforhimtolivein.Pleasegivemesomepaper(pens) towriteon(with).五.不定式做状语:1.不定式（短语）常跟在com
4、e，go，run，hurry等动词后作目的状语；或以“inorderto+动词原形”、“soasto+动词原形”等形式出现，或回答what...for？/why...？问句。例如：-Hi，Peter！Whyareyouinsuchahurry？-Tocatchthe7：30train.[提示]有时目的状语可置于句首，意为“为了……”，相当于inorderto.例如：Tocatchthebus，youmustgetupearly.在stop后的动词不定式其实是作目的状语，意为“停下来做另一件事”。例如：Let’sstoptohaveameal
5、.Iknowagoodrestaurantnearhere.2.作结果状语的不定式常以“enoughto...，onlyto...，too...to...”等形式出场，并能简化成so...that...句式。例如：LiuMeiwassoluckythatshereceivedmanybooksfromProjectHope.LiuMeiwasluckyenoughtoreceivemanybooksfromProjectHope.六.不定式做宾语补足语:1.用做make,let,have等使役动词的宾语补足语,省去不定式符号to.make(
6、let/have)sbdosth.Don'tlethergotherealone.2.用做see,lookat,listento,hear,watch,notice等感官动词的宾语补足语,亦省去不定式符号to.Ioftenhearagirlplaytheviolinintheevening.3.用做want,like,tell,ask,order,wish....的宾语补足语时,不能省去不定式符号to.Theteachersoftentellustostudyhardatschool.七.其它用法:1.小品词to的回避与复出许多动词如tea
7、ch，ask（要；让），tell，beg等后常有带to的动词不定式作宾补；但let，have，make（让；使），feel，hear等后作宾补的不定式结构，to要回避。但在被动语态里to须“重出江湖”；help后作宾补的不定式可加to，也可省略to.例如：Thepolicemanmadetheyoungwomanmovehercar.Theyoungwomanwasmadetomovehercarbythepoliceman.[提示]对不定式进行否定可在其前加not.如：letsbnotdosth；tellsbnottodosth.把直接引
8、语为祈使句的句子变为间接引语，直接引语一般转换成不定式作宾补。例如：Thepolicemansaid.“Don’tplayfootballinthestreet，children
