.形容词和副词比较等级的用法I）同级比较：1甲与乙相比程度相同：用as+原级形容词/副词+as2甲与乙相比，甲不及乙：用notas/so+形容词/副词as。
如：Dickisastallashisbrother.TomspeaksChineseasfrequentlyasJack.Thepictureis(not)asbeautifulasthatone.II）比较级：1.表示A超过B。
此时用形容词和副词的比较等级more(adj/adv+er)+than Ourclassroomisbrighterthanyours.HedidmorecarefullyintheexamthanI.Idon’tthinkmathismoreimportantthanphysics..2表示A不及B用句型：less+形容词/副词的原级+than=notas/so+形容词/副词as=notmore---than---如：这幅画比不上那幅画漂亮2.比较级的修饰语。
这些修饰语通常为副词或短语，置于比较级前面，说明比较级的程度。
这些词有：alittle,little,abit,bit,alot,agreatdeal,much,far,rather,slightly,byfar, even,still,nearly,almost,any,just,(…)times等。
Themoonismuchsmallerthantheearth. Theresultoftheexperimentturnedouttobeevenbetterthanexpected. Speakabitmoreslowly,please.3．形容词和副词比较级的特殊用法1）moreandmore越来越……如：Youaregrowingtallerandtaller. Englishisbecomingmoreandmoreimportant.2).Themore--------,themore-----------.越……，越……Theharderheworks,thehappierhewillfeel. Themorecarefulyouare,thebetteryouwilldointheexam. Theharde ryoustudy,thegreaterprogressyou’llmake.4)倍数的表达法①倍数（half,once,twice,…times+as+形容词+as②倍数+形容词比较级+than…③倍数+the(size,height,length,weight,width,depth,age)+of…Thewhiteboxisfourtimesdeeperthantheblackbox. Thisroadistwicelongerthanthatone. Theredbuildingistwicetheheightofthegreybuilding. Ourschoolisthreetimesthesizeofyours. Thestreetisfourtimesthelengthofthatone. Theoutputofthepapermillisthreetimeshigherthanitwaslastyea 5)否定词not与never与比较级连用相当于最高级(1)Youcan’tdoitbetter.=Youdoitthebest.(2)Theteachercan’texplainthegrammarmoreclearly.=Theteacherexplainsthegrammarthemostclearly.(3)__Whatdoyouthinkofthefilm__Wonderful.I’veneverseenabetterone.=ThisisthebestfilmthatI’veseen.(4)YousingverywellandI’veneverheardamorebeautifulvoice=----(5)Howwonderfullyshesings!I’veneverheardabettervoice.=---II.形容词和副词比较等级练习I.Choosethebestanswer1.------Whatdidyoulikethefilm-------It’swonderful.-I’veneverseen_______.A.abetterB.aworseC.thebestD.theworst2.Thenumberofpeoplepresentattheconcertwas_______thanexpected.Therewerem anyticketsleft.A.muchsmallerB.muchmoreC.muchlargerD.manymore3.ItisreportedthattheUnitedStatesuses___energyasthewholeofEurope.A.astwiceB.twicemuchC.twicemuchasD.twiceasmuch4.Thehouserentisexpensive.I’vegotabouthalfthespaceIhadathomeandI’mpay ing_____here.A.asthreetimesmuchB.asmuchthreetimesC.muchasthreetimesD.threetimesasmuch5.Ourneighborshas__________ours.A.asabighouseasB.asbigahouseasC.thesamebighouseasD.ahousethesamebigas6.Themoreyouread,_________.A.themoreyoulearnB.themoreyou’lllearnC.moreandmoreyouyou’lllearnD.you’lllearnthemore III.spend,cost,take,pay和payfor（1）spend.他花了很多钱买了这辆新车。
他平时把尽可能多的时间花费在读书上。
（2）cost：.这本书用了他一美元。
.乘船到伦敦要用12英磅（3）take.到邮局用去了我十分钟时间。
他们用了两年时间拍这部新影片。
（4）pay他花了很多钱买了这辆新车..这本书用了他一美元。
（5）payfor.你得付你的饭费.IV.notuntil1.NotuntilIbegantowork_____howmuchtimeIhadwasted.A.didn’tIrealizeB.didIrealizeC.Ididn’trealizeD.Irealize2.Notuntilallthefishdiedintheriver_____howse riousthepollutionwas.A.didthevillagersrealizeB.thevillagersrealizedC.thevillagersdidrealizedD.didn’tthevillagersrealize3.NotuntilIbegantowork____howmuchtimeIhadwasted.A.didn'tIrealizeB.didIrealizeC.Ididn'trealizeD.Irealized4.Notuntilhearrivedhome_____hefindthatthiswallethadbeenstolen.A.didB.wouldC.whenD.that5.Notuntilhisfatherwasoutofprison____toschool.A.canJohngoB.JohncangoC.couldJohngoD.Johncouldgo6.Notuntilallthefishdiedintheriver_____howseriousthepollutionwas.A.didthevillagersrealizeB.thevillagersrealizedC.thevillagersdidrealizedD.didn’tthevillagersrealize7.Itwasabout600yearsago______thefirstclockwithafaceandanhourhandwasmade.(97全国卷)A.thatB.untilC.beforeD.when8.Itwas___backhomeafter theexperiment.(04湖北卷)A.notuntilmidnightdidhegoB.untilmidnightthathedidn’tgoC.notuntilmidnightthathewentD.untilmidnightwhenhedidn’tgo9.Itwasn’tuntilnearlyamonthlater_____Ireceivedthemanager’sreply.(05全国卷I)A.sinceB.whenC.asD.that10.Itwasnotuntilshegothome_______Jenniferrealizedshehadlostherkeys.(06全国卷II)A.whenB.thatC.whereD.beforeV+edformed分词既可以作前置定语,也可以作后置定语。
.1单个的过去分词作前置定语。
.1）及物动词的过去分词具有被动和完成意义。
如:Isawabrokencup onthetable.Hetookcareofawoundedsoldier.HisspokenEnglishispoor.2）.不及物动词的ed形式不表被动只表完成。
Sheisagrownwoman.Thepolicearerunningafteranescapedprisoner Inautumnfallenleavescanbeseenontheground.Theylookedupattherisensun.Youshoulddrinkboiledwater.2.作后置定语，通常是及物动词的过去分词,过去分词短语作定语通常后置，其作用相当于被动的定语从句，ed前不加be动词。
如:1）.ThisisacolorTVsetproducedlastyear=Thisis acolorTVsetthatwereproducedlastyear2）.Thisisaletterwrittentomebymydaughter=Thisisaletterthatwaswrittentomebymydaughter一封我女儿写给我的信3）.IsthisthebookwrittenbyHenryJames=Isthisthebookwhich/thatwaswrittenbyHenryJames4）.Hewasaprofessorrespectedbyalltheteachersandstudents ofthecollege.=Hewasaprofessorwho/thatwasrespectedbyalltheteachersandstudentsofthecolle ge练习：改写下列句子。