仔细观察找相同点1.Thedifficulityistostoppeoplekillingthem.2.Weneedtohelpthepeoplewhoisintrouble.3.Idecidetogotovisitmyfriendnextweek.4.Tolearnmathwellisveryhard.5.Mymotherasksmetobuysomeapples.6.Yourmotherasksyoutogohomeandeatdinner.你发现什么了?Grammar:动词不定式动词不定式的概述:1.当我们想表达“想做某事、决定去做某事或者让某人去干某事”的时候,就会出现俩个动词连用的情况,这个时候我们在英语里怎么表达?这就要用到我们今天学的动词不定式来表达。2.什么是动词的不定式呢?就是“to+动词原形”的形式。注意:动词不定式是非谓语动词的一种。它既有动词的性质又有名词的性质,但是它没有人称和数的变化。在句子当中不能单独做谓语。3.动词不定式有什么语法功能呢?我们一起来看。一动词不定式的结构:肯定:to+动词原形Itellhertocleantheroom.否定:在to前面加not,即notto+动词原形。Heasksmenottoplayinclass.二动词不定式的语法功能:1.作主语:当动词不定式太长的时候,常采用it来做形式主语,把真正的主语放在后面,避免头重脚轻。不定式做主语的句式为:Itis+形容词/名词+todosth.Eg:Itisveryinterestingtoreadthisbook.Toreadthisbookisveryinteresting.ItisankeytoreciteforstudyingEnglishwell.TorecitethewordsisankeyforstudyingEnglishwell.2.作宾语:不定式通常放在一些及物动词的后面做宾语,这些词有want,ask,tell,hope,wish,manage,learn,try,promise,pretend,refuse,plan,decide,offer,forget,remember,like,love,stop,expect,agree,等。Eg:Shewantstobecomeateacherinthefuture.Iforgettoclosethewindow.Ilearntocookthemeals.Itrytomasterthisskill.3.做表语:不定式做表语通常放在be动词或seem,appear等连系动词之后,常用说明主语的具体内容。Eg:Thequestioniswhentostart.问题是什么时候开始。WhatIwanttoknowiswhotoblame.我想知道的是该责备谁。Mydreamistobecomeasinger.判断下列的动词不定式在句中做什么成分。1.Ihopetomakelotsofmoney.2.Yourdutyistolookafteryoursister.3.Ittakesmethreedaystomakeakite.4.TostudyEnglishisdifficult.5.Iwanttoeatanice-cream.6.Itisusefultoreadthebook.7.Herjobistoteachstudents.8.Wemustremembertolockthedoor.9.Myfamilybegintoeatdinner.宾语表语主语主语宾语主语表语宾语宾语4.做宾语补足语:通常跟在一些动词后面做补语,常见的这类动词有want,tell,help,see,teach,ask,advise,like,allow,wish,invite,find等。Eg:Mysisterasksmetobuysomebananas.Tominvitedhisfriendstotakepartinhisbirthdayparty.MissGaoteachesusEnglish.Iwishyoutohelpme.5.做定语:一般放在它所修饰的名词或者代词之后,起一个形容词的作用。Eg:Ihavelotsofworktodo.Theyhaveanimportantmeetingtoattend.Pleasegivemesomethingtoeat.6.做状语:不定式在句子当中可以做目的、原因、结果状语。1.目的状语,置于句首或句末,置于句首时常表示强调。如:1)Inordernottooffendpeople,learningaboutlanguageetiquetteisjustasimportantaslearninggrammarorvocabulary.2)Agroupofyoungpeoplegottogetherto(inorderto/soasto)discussthisquestion.[todo/inordertodo/soastodo用作目的状语,置句末时都可以用,置句首时只用todo/inordertodo。soastodo一般不置于句首,可以引导结果状语从句,inordertodo不引导结果状语从句。]2.原因状语,多见于“sb.+be+adj.+todo...”结构句中。如:1)Mydogsnameis“Lucky”—agoodnameforhimbecauseIfeelveryluckytohavehim.2)OnMondayhetoldaradiointerviewerthathehadrunoutofmoneytobuyoldbikes.3.结果状语,多见于“too...to”,“enoughto...”结构句中。如:1)ThenI’mtootiredtodowell.WhatshouldIdo?2)Theroomneedstobebigenoughforthreepeopletolivein.不定式的注意事项:一、有些使役动词和感官动词跟不带to的不定式。这些动词有:“四看”,"三让","二听",“一感觉”,“一注意”。四看:lookat,see,watch,observe三让:have,let,make一感觉:feel一注意...