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1、学案3动词不定式制作人马宇20113.2—3.3动词不定式在句中可充当主语、表语、宾语、宾补、定语和状语等。8一、作主语动词不定式作主语可位于句首。例如：Tolearnaskillisveryimportantforeveryoneinsociety.也可使用it作形式主语，而将其置于句末。例如：Itisnecessaryforyoungstudentstolearnaforeignlanguage.动词不定式作主语的常用句型有：1.Itis＋adj./n.(＋forsb.／sth.)＋todo
2、sth.用于此句型的形容词有：easy,hard,difficult,possible,important,impossible,necessary,good,bad,exciting,interesting,surprising等。例如：Itisinterestingtoplaythisgame.Itisnecessaryforyoutochangeyourjob.Itwasimpossibleforthemtocompletethetaskinsuchashorttime.考例1：Is___
3、_possibletoflytothemooninaspaceship?(88MET)A.nowB.manC.thatD.it用于此句型的名词有：pity,shame,pleasure,one’sduty,one’sjob,fun,joy,goodmanners,badmanners等。例如：Whatapityitisforyoutohavemissedsuchawonderfulfilm.Itisgoodmannersfortheyoungtogivetheirseatstotheold.2.
4、Itis＋adj.＋ofsb.＋todosth.该句型中只能使用描述某人的品德、特征的形容词，如：kind,nice,wise,silly,polite,impolite,friendly,foolish,clever等。例如：Howrudeitwasoftheboytojumpthequeue!Itisfriendlyofthefamilytotrytomakemefeelathomeintheirhouse.Howsillyitwasofyoutogiveupsuchagoodchance！
5、3.Ittakessb.＋sometime＋todosth.该句型意为“做某事花费某人多长时间”。例如：Ittookushalfanhourtoridetothetownbybike.二、作表语8动词不定式作表语常用于以下结构：Mywish/job/aim/goalis…及Thenextstep/measureis…等。例如：Yourjobistotypethepapersintheoffice.Thenextmeasureistostoptheriverfrombeingpolluted.三、
6、作宾语常见的只能使用动词不定式作宾语的动词有：agree,choose,decide,hope,fail,wish,refuse,expect,manage,plan,intend,pretend,promise,offer,afford,demand,arrange等。例如：Theydecidedtobuildahighwaybetweenthesetwocities.SheofferedtohelpmewhenIwasintrouble.believe,think,consider,feel
7、,make等动词可用于“动词+it+adj./n+todosth.”句型，其中使用it作形式宾语，而将真正的宾语动词不定式置于句末。例如：Ithinkitnecessaryforustohaveagoodrestafterthelongwork.Shefeltitherdutytohelptheoldwoman.四、作宾补可后接动词不定式作宾补的动词有：advise,allow,ask,hear,order,see,tell,want,wish,watch等。例如：Thedoctoradvise
8、dhernotoeattoomuchsugar.Iwishyoutogotothemeetingwithme.believe,consider,count,declare,deny,feel,find,guess,imagine,judge,know,prove,realize,suppose,think等动词后可接tobe型不定式作宾补。例如：Hedeclaredhimselftobeacollegestudent.他自称是名大学生。Thepoliceprovedhimtobeathief.警
