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1、非谓语动词动词不定式构成不定式由’to+动词原形’构成，是非谓语动词的一种，即不能做谓语，没有人称和数的变化。不定式加上它的宾语和状语构成不定式短语，可做谓语以外的其他句子成分。不定式的作用1、作主语1）不定式todo直接放在句首作主语Tofinishtheworkintenminutesisveryhard.Toloseyourheartmeansfailure.Todothatsortofthingisfoolish.续上：Tomasteraforeignlanguageisreallyimportantnowadays.Togiveupsmokin
2、gisright.不定式的作用2）It作形式主语放句首，真正的主语不定式放在句后。Itisveryhardtofinishtheworkintenminutes.Itmeansfailuretoloseyourheart.不定式的作用It作形式主语常用句式:a.It+be+名词+todoItisyourdutytoobeytherulesatschool.It’sgoodmannerstohelpothersintrouble.不定式的作用b.Ittakessb.+sometime+todoIttakestimeandefforttomasterEngl
3、ish.Ittookustwohourstofinishthejob.Ittakesmehalfanhourtogotoschool.不定式的作用c.It+be+形容词+for+sb+todoItisimpossibleforustomasterEnglishinashorttime.Itisagainsttheregulationforyoutoparkyourcarhere不定式的作用d.It+be+形容词+ofsb+todoIt’skindofyoutohelpmewithmymath.(形容词常用clever,good,foolish,hones
4、t,kind,nice,silly,stupid，wise等表示赞扬或批评的词。)不定式的作用2.作表语Yourjobistowashdishes.Toseeistobelieve眼见为实Allyouhavetodoistofinishitquickly续上：Ourmaintaskistodevelopthestudents’abilitytosolveproblems.Herwishistobecomeadoctor.不定式的作用3、作宾语1）V+todoShepromisedtogivehimanotherchance.Ihopetoseeyouag
5、ain.HedecidestolearnEnglishwell.不定式的作用以下动词后常跟todo形式：agree,demand,ask,decide,expect，hope，want,offer,plan,pretend，promise,afford,prepare,refuse,manage,fail,dare,fear,swear,choose等。例句：Hedidn’thaveanymoney,sohedecidedtolookforjob.Shepretendedtobeill.Hemanagedtofinishhishomeworkintime
6、.不定式的作用2）少数介词后面可跟不定式作宾语Ithasnochoicebuttoliedownandsleep.Theyhavenochoicebuttostaythere.Theydidn’topentheirmouthsexcepttocomplain.不定式的作用但是，Can’tbut,can’tchoosebut,can’thelpbut,donothingbut,ratherthan,hadbetter等之后省略to。There’snothingtodoexcept/butwaittillitstopsraining.Hedoesnothin
7、gbutplayallday.不定式的作用3)作宾语补足语Theteachertoldhisstudentstopaymoreattentiontotheirpronunciation.Iwouldliketheproblemtobediscussedatthenextmeeting.续上：Iwarnedthepatientnottodrinkcoldwateraftertheoperation.Sheaskedmetostaythere.不定式的作用注意:以下动词：feel,hear,listento,make,have,let,seewatch,no
8、tice,lookat,observe与不带to的不定式连用。Theteache
