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时间:2019-05-21
《九年级英语teenagersshouldbeallowedtochoosetheirownclothes语法透视含情态动词的被动语态素材》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、Unit7Teenagersshouldbeallowedtochoosetheirownclothes【语法透视】:含情态动词的被动语态1.含情态动词的被动语态的基本结构为“情态动词+be+及物动词的过去分词”。Manytreesshouldbeplantedonthemountains.应该在树上植许多树。Studentsshouldbeallowedtogotoschoolbybike.应该允许学生们骑自行车上学。2.把含情态动词的主动句变成被动句,即把“情态动词+动词原形”改为“情态动词+be+过去分词”,
2、此时,作主语的要用动词承受者。Weshouldcleantheclassroomeveryday.→Theclassroomshouldbecleanedeveryday.3.句式的转换(1)否定句:在情态动词后加not就行。Thesebookscan’tbereadforchildren.这些书孩子们不能读。(2)一般疑问句:直接将被动语态的陈述句的情态动词提到的句首。ShouldAnnbeallowedtowearherownclothes?应该允许安选择自己的衣服吗?(3)特殊疑问句:由疑问词加上含有情态动词
3、的被动语态的一般疑问句构成。Whenmustmyhomeworkbehandedin?我的作业必须何时交?4.对含有情态动词的被动语态的一般疑问句的回答,一般应保留原句中的情态动词,但must表示“必须”时,其否定回答用needn’t。—Shouldmyhomeworkbefinishedtoday?我的作业应在今天完成吗?—Yes,itshould./No,itshouldn’t.是的,应在今天完成。/不,不应在今天完成。—Musttheroombecleanedrightnow?房间必须马上打扫吗?—Yes,i
4、tmust./No,itneedn’t.是的,必须立即打扫。/不,不必立即打扫。典例题解〖例1〗Teenagersshouldtochoosetheirownclothes.A.allowB.toallowC.beallowedD.allowed〖解析〗C。主语teenagers是动作allow的承受者,再根据should确定要用情态动词的被动语态,即“情态动词+be+过去分词”。〖例2〗-Whatshouldwedofirstifwewanttodevelopourvillage?-Alotofnewroads,
5、Ithink.A.havetobuildB.mustbuildC.havebuiltD.mustbebuilt〖解析〗D。newroads是动作build的承受者,应用被动语态。含must的情态动词的被动语态为“must+be+情态动词”。〖例3〗Thiskindoffood_____cool,cleananddryaccordingtotheinstruction.A.shouldbecarriedB.mustbeputC.shouldbeplacedD.mustbekept〖解析〗D。根据句意,主语food是动
6、作的承受者,用被动语态,而空格后的cool是形容词,而“keep+某物+形容词”意为“使……保持……状态”,故选D。〖例4〗Smoking____inpublicplaces,sodon’tsmokehere.A.allowsB.isallowedC.doesn’tallowD.isn’tallowed〖解析〗D。主语smoking是动作allow的承受者,排除A和C。由sodon’tsmokehere可知这儿禁止吸烟,故选D。语法精练I.用括号内所给单词的适当形式填空。1.Howmanymagazines____
7、(canborrow)inyourlibraryeveryweek?2.Inmanycountries,teenagersunder18____(shouldnotallow)togointoInternetbars.3.Somepeoplethinktrees____(shouldplant)onTreeplantingDayonly.4.Theflowers____(mustwater)everyday.5.Adictionary____(canuse)intheexam.II.同义句转换,每空一词。1.Stu
8、dentsshouldcleantheirclassroomeveryday.Theirclassroom_____________everyday.2.Canyoumendthisradio?____thisradio________?3.Weshouldnotallowfifteen-year-oldstoworkatnight.Fifteen-year
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