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1、PassiveVoice1.把原句的宾语改为主语。2.把原句的谓语动词改为被动语态结构(be+p.p.)3.把原句的主语改为by的宾语（用宾格）,可省略。e.g.Shecleanedtheroom.Theroomwascleaned(byher).主动语态句子变成被动语态句子哪三个部分要变？怎么变？(一)语态转换时要注意的问题1.把主动语态变为被动语态时，其谓语动词的时态要与原句时态保持一致，其谓语动词的数要与新主语保持一致。Wehaveboughtanewcomputer.Anewcomputerhasbeenbought.(正确)Anewcomputerhavebe
2、enbought.(错误)2.含有双宾语的主动句变被动句时，可分别将其中的一个宾语变为主语，另一个不动，一般变间接宾语为主语时比较多。Myunclegavemeapresentonmybirthday.Iwasgivenapresentonmybirthday.如果把直接宾语(指物)改为主语，则在间接宾语(指人)前加适当的介词，如上句还可以说：Apresentwasgiventomeyesterday.保留宾语注意：一般在下列动词后，常在间接宾语前用介词to，如：bring,give,lend,offer,pass,promise,sell,show,teach,tel
3、l等。eg.Thecupwithmixturewasshowedtotheclass.Mybikewaslenttoher.一般在下列动词后，间接宾语前用介词for,如：buy,cook,choose,fetch,get,,make,order,等。eg.Mothermademeanewskirt.(Anewskirtwasmadeforme.)Themeatwascookedforus.3.由动词+介词或副词构成的短语动词，要把它们作为整体看，即把它们看成一个及物动词，介词或副词不可与动词拆开或漏掉.这类动词有laughat,operateon（做手术）,lookaf
4、ter,makeuseof（利用）、takecareof,giveup,handin,pointout,putaway（把...收起来，放好）,putoff（推迟）,turndown,workout,talkabout等。Thepatientisbeingoperatedon.Theproblemissolved.Itneedn'tbetalkedabout.Hisrequestwasturneddown.Thesportsmeetwillbeputoffbecauseofthebadweather.Achildistakengoodcareof4.注意：在see,wa
5、tch,hear,notice,listento,lookat,make,feel等动词后作宾语补足语的动词不定式都不带to，但改成被动语态后都带to，Weoftenhearhimplaytheguitar.→Heisoftenheardtoplaytheguitar.Hismothermakeshimcleantheroomeveryday.→Heismadetocleantheroomeveryday.（二）某些动词用主动表被动？1.Thepicturelooksbeautiful.这里的look是表状态特征的连系动词，它后面要求跟形容词或名词构成系表结构，其主动形
6、式表被动含义。感官系动词一般用主动形式表示被动意义，如：feel，look,seem,taste,sound,remain,turnout,smell等。—Doyoulikethematerial?—Yes,itfeelsverysoft.TheflowerslookbeautifulWhathesaidsoundsreasonable.Therosessmellsweet.Themedicinetastesbitter.误：Itisfeltverysoft.Thefoodtastesdelicious.误：Thefoodistasteddelicious.Thepop
7、musicsoundsbeautiful.误：Thepopmusicissoundedbeautiful2.want,need,require作“需要”解时及beworth,inneedof后接动词，常用动名词的主动形式表被动含义。Eg:1:Theflowerneeds/wants/requireswatering.Yourhairneeds/wants/requirescuttingThecomputerneeds/wants/requiresreqairing2:Thefilm/musicisworthlisteningto.3:Hi
