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1、WelcometoourclassWelcometoourclassWelcometoourclassGrammarandusageUnit1★To-infinitive★Bareinfinitive★Verb-ingformasanounGrammarItoinfinitive(不定式)动词不定式的使用Todolikethatisfoolish.Iwanttoseeyou.Iamtovisityou.Hehaslotsofworktodo.IstudyhardtoimproveEnglish.Theteacheraskmetoanswerthequestion
2、.主语宾语表语定语状语宾补作主语TolearnEnglishisreallyimportantnowadays.Tobeadoctorismydream.1.学习外语真的很重要。2.做一名医生是我的梦想。Subject动词不定式和不定式短语做主语时,常用it做形式主语,其句型结构为:Itis+形容词或名词(或词组)+不定式短语…这时的形容词常为easy,difficult,hard,good,useful,wrong,right,necessary,impossible,important等。名词或词组常为afact,agreatday,agreatthing,
3、apity等。Tip:作宾语Freddidn’thaveanymoney,sohedecidedtolookforajob.Hepromisednottotellanyoneaboutit.1.Fred没有钱,所以他决定找一份工作。2.他答应不告诉任何人这事。ObjectCanyougivesomeexamples?作表语Mytaskistofinishthehomework.Toseeistobelieve.1.我的任务是去完成作业。2.眼见为实。Predicative作定语Doyouhaveanythingtosay?1.你有什么要说的吗?2.Betty是第
4、一个知道这真相的人Bettywasthefirsttoknowthetruth.Attribute注1:不定式做定语时,表示未做。Ihaveaveryimportantmeetingtoattendtomorrow.注2:动词不定式用作定语时可以放在一些名词的后面。如:attempt,ability,chance,desire,determination,decision,effort,failure,intention,needandopportunity.注3:当名词被序数词修饰时,常用不定式作定语作状语Hespokeloudly(soas/inorder)
5、tobeheard.Iamhappytohearthenews.I’mtootiredtowalkanyfurthertonight.目的状语.原因状语.结果状语Adverbial作宾补Sheaskedmetostaythere.1.她叫我呆在这儿。2.请允许我介绍Mr.White给你们。PleaseallowmetointroduceMr.Whitetoyou.ObjectcomplementIIBareinfinitive(不定式符号to的省略)我听到他唱流行歌曲Iheardthemsingapopsong.我看到他们踢足球了Wewatchedthempla
6、yfootball.他让我擦玻璃Hemademecleanthewindow.A.有些动词后面的不定式不带to,“5321”如see,watch,notice,observe(五看).make,have,let(三让)hear,listento(二听)feel(一感)主动省“to”,被动加“to”注意I’dratherstayathomeinsteadofwatchingthefilm.You’dbettertidyyourbedroom.WhynotvisityourcousininJapan?BWeusethebareinfinitiveafter:woul
7、drather,hadbetter,andwhynot注意C①介词but,except,表示“除了”后接不定式作宾语时,介词前有行为动词do,不定式省to。②当主语部分有行为动词do,不定式做表语省to。“前有do,后省to”wehadnothingtodobut/exceptwait.WhatIwanttodoisfindsomebooks.注意D.两个或两个以上的不定式由连词and,or,but,ratherthan连接时,第二个不定式符号to开始,往往省略。1.Wouldyouliketogoshoppingorwatchfilms.2.Idecideto
8、workratherth