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1、Non-restrictiveattributiveclauses限制性定语从句与先行词之间不用逗号隔开；非限制性定语从句与先行词之间一般用逗号隔开。Mycousinwhosefatherisateacherwantstobeanactor.Mycousin,whosefatherisateacher,wantstobeanactor.1.A.ThisistheplacewhereIlivedtenyearsago.B.Theschool,whereIoncestudied,wasbuiltthirtyyearsago.2.A.HeisamanwhoIcanaskforhelp.B.Hisfa
2、ther,whoworksinBeijing,camebackyesterday限制性定语从句和先行词关系密切，如果去掉从句，剩余部分意义不完整；非限制性定语从句只是先行词的附加说明，如果去掉从句，意义仍然完整。1.Ihaveasisterwhoworksinahospital.我有一位在医院工作的姐姐。2.Ihaveasister,whoworksinahospital.我有一位姐姐，她在医院工作。3.Allthemagazinesherewhichhavebeautifulpicturesinthemwerewrittenbyhim.里面有漂亮图画的那些杂志是他写的。4.Allthemag
3、azineshere,whichhavebeautifulpicturesinthem,werewrittenbyhim.所有的杂志都是他写的，里面都有漂亮的图画。有时同一个限制性从句变为非限制性从句会改变全句的意思（不只一位姐姐）（只有一位姐姐）（杂志有带图画和不带图画两类）（杂志只有一种）Fillintheblankswithproperrelativewords.1.Thefamousbasketballstar,_____isanAmerican,cametoChinayesterday.2.Inthosedays,sheusedtogotoMrblack,with_____sheha
4、dawonderfultime.3.Iboughtacaryesterday,_____costmealot.4.Xi’an,______Ivisitedlastyear,isaniceoldcity.5.HewillcometoseemenextJuly,___hewon’tbesobusy.6.Theschool,_______Ioncestudied,wasbuiltthirtyyearsago.7.Johnsaidhe’dbeenworkingintheofficeforanhour,_______wastrue.whowhomwhichwhichwhenwherewhichAreth
5、esesentencesattributiveclauses?Hetoldmeastory,whichisalreadyknowntoall.Hecamelate,whichmadetheteacherangry.Hemissedthemovie,whichwasagreatpity.“which”canbeusedtoreferto__________________.Heissuchacleverboy____cansolveallthequestions.Thisissuchaninterestingbook____interestsallstudents.Thisissodifficu
6、ltaquestion____noonecanworkout.Heissopopularaperson___weallliketotalkwith.Iboughtthesamecar___heisdriving.asasasasas1.Heisahardworkingstudent,___weallknow.2.Hehaswonfirstprize,____weallexpected.3.____wehoped,hecametohelpus.4.___wasplanned,theworkwasfinishedontime.“as”canbeusedtorefertoawholesentence
7、.asasAsAsWhich和as引导非限制性定从时的用法区别：1.which引导的非限制性定从不能置于句首，而as非限定从可放在句首，句中或句末。2.由as构成的常见搭配如：asweallknow,asisknowntoall,asissaidabove等表“正如…”之意，而which不能。3.As引导的从句在意义上一般不与主句意义相背离。as引导的非限制性定语从句一些固定句型：1．ashasb
