牛津译林版（2019）必修 第三册Unit 2 Natural disasters Grammar and usage课件.pptxVIP

Unit2Grammarandusage

时态形式主动式被动式一般式todotobedone完成式tohavedonetohavebeendone进行式tobedoing/否定形式在to前加not功能：不定式可以做主语，宾语，表语，宾补，定语或状语。

Hedecidedtobuyanewcar.Thefirewasthoughttohavestartedinanupstairsroom.Isorrytohavegivenyousomuchtrouble.Heseemstobeworryingaboutsomething.=Itseemsthatheisworryingaboutsomething.Don’tpretendtobeworkinghard.Justdowhatyoushould.Thestudentswanttobesenttoworkinthecountryside.Hewantedthelettertobetypedatonce.I’vealreadywarnedyounottocopyother’shomework.Ipromisednevertobetraymycountry.

不定式做主语It’scommonforleavestofallfromthetreesinautumn.Itis+adj+ofsbtodosthItissillyofyoutotrustsuchaman.Itisselfishofhimnotdoanythingfortheorphans.It’sunfairofyoutosaysuchthingsabouther.主语+be+adj+todoIthinktheseproblemsareeasytoworkout,soyoudon’thavetoasktheteacherforhelp.Themachineisveryeasytooperate.Anyonecanlearntouseitinafewminutes.

不定式做定语Marywasthefirstgirltoworkouttheproblem.Thisisthebestwaytosolvetheproblem.Tomwastheonlyonetoknowthetruth.注意：名词前有序数词或最高级或theonly,thevery,theonly,thelast,thenext等修饰时，用todo做后置定语。Pleasegivemeaknifetocutwith.Thetravelersfinallyfoundatempletolivein.Hereissomepaperforyoutowriteon.注意：在动宾关系中，如果不定式是不及物动词，其后面的介词不可以省略

常见可跟不定式做定语的名词有：time,place,way,reason,decision,chance,opportunity,attempt,effort,right,ability等Hehasgivenuptheplantobuyanewcar.Hisdreamtogotocollegehascometrueatlast.Isthatthebestwaytosolvetheproblem?Hewasgivenanopportunitytostudyabroad.

动词不定式做状语常用短语搭配onlyto,too……to…,enough……to……,so…asto…,such…asto..Heistooexcitedtosayanything.Thebagistooheavyformetocarry.Hewasbraveenoughtodowhathewantedto.Theroomisbigenoughtoseatallofus.Wehavepreparedsoplentyoffoodastotreatourgu