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1、Unit1Module4GrammarandusageTo-infinitiveandVerb-ingformasanounPart1To-infinitive1.todoasasubjectThecatsaid,“Totakerollercoasteristerrible”.不定式短语作主语时，可以直接放在句首，但在很多情况下，尤其是在疑问句和感叹句中，往往放在谓语之后，而用先行代词it作形式主语。Thecatsaid,“It’sterribletotakerollercoaster.”Howlongdidittakeyoutotakerollercoaste
2、r?Howterribleitistotakerollercoaster!过山车.wmv不定式作主语常见句型：a)Itis+adj.(easy,important,difficult…)+不定式b)Itis+n.(apity,apleasure,one’sduty,ashame…)+不定式c)Ittakes/needs/requires+sometime(hours,months,days,patience…)+不定式Itrequirespatiencetobeagoodteacher.It’smydutytoteachyouhowtobeastudentofo
3、urSchool.2.todoasapredictiveOurmostimportanttasknowistomakeaplan.当句子的主语是aim,idea,policy,question,suggestion,wish,task,duty,job,purpose等或者主语是what引导的名词性从句时，后面可以用不定式做表语，用以说明主语所包含内容。注：作表语的不定式都带to，但当主语部分有实义动词do时，to可以省略。Nowtheonlythingwecandoiswait.3.todoasanobjectThecatsaid“Remembernottot
4、akeitnexttime!”(Tips:不定式否定为notto)a)可以直接用不定式作宾语的动词很多，如agree,afford,tend,ask,decide,determine,expect,fail,hope,learn,intend,manage,offer,plan,promise,refuse,want,wish天津卷12题：Idon’twant_____likeI’mspeakingillofanybody,butthemanager’splanisunfair.A.tosoundB.tobesoundedC.soundingD.tohaveso
5、unded当不定式短语比宾补长时，往往将不定式放到宾补后，而用先行代词it作形式宾语，常用动词有feel,think,find,believe,consider,make等。Thecatfeltitterribletotakerollercoaster.b)只有少数介词如but,except等后面可以跟不定式作宾语。一般情况下作介词宾语的不定式都带to，但如果but或except所在句子里的谓语动词含有do,does,did时，通常省略to。Wehavenochoicebuttowait.Wecandonothingbutwait.4.todoasanobjec
6、tcomplementYoushouldgetthemtohelpyou.(Theywillhelpyou.)Theybelievedhimtobehonest.(Hewashonest.)(常用谓语动词有:get,ask,force,order,tell,invite,allow,wish,want,like,expect,advise,beg等。)但在谓语动词believe,find,think,feel,consider,suppose,imagine,prove等后面跟tobe…作宾补,不跟todo…Thebossmadeherworklonghours
7、.主语谓语宾语宾补She主语wasmade谓语towork主补longhours(byherboss).全国卷(I)No.18Whilewatchingtelevision,______.A.ThedoorbellrangB.ThedoorbellringsC.WeheardthedoorbellringD.Weheardthedoorbellrings2005福建卷No.23IfanyonehappenstodropinwhileI’mout,_____himorherleaveamessage.A.haveB.getC.askD.tellTips:有些动词后
8、面须接不带to的不定式做
