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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.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.SheisgoingtospendthewinterholidayinMacao,whichreturnedtoChinain1999.2.A.HeisamanwhoIcanaskforhelp.B.Hisfather,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。S=subject,P=predicate,O=object,Myhouse,whichIboughtlastyear,hasgotalovelygarden.Myhouse,whichIboughtlastyear,hasgotalovelygarden.我的房子有个漂亮的花园，房子是去年买的。Myhouse,whichIboughtlastyear,hasgotalovelygarden.我的房子有个漂亮的花园，房子是去年买的。MainclauseMyhouse,whichIboughtlastyear,hasgotalovelygarden.我的房子有个漂亮的花园，房子是去年买的。MainclauseMyhouseMyhouse,whichIboughtlastyear,hasgotalovelygarden.我的房子有个漂亮的花园，房子是去年买的。MainclauseMyhousehasgotalovelygarden.Myhouse,whichIboughtlastyear,hasgotalovelygarden.我的房子有个漂亮的花园，房子是去年买的。MainclauseMyhousehasgotalovelygarden.SMyhouse,whichIboughtlastyear,hasgotalovelygarden.我的房子有个漂亮的花园，房子是去年买的。MainclauseMyhousehasgotalovelygarden.SPMyhouse,whichIboughtlastyear,hasgotalovelygarden.我的房子有个漂亮的花园，房子是去年买的。MainclauseMyhousehasgotalovelygarden.SPO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。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。1.Ihaveasisterwhoworksinahospital.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。1.Ihaveasisterwhoworksinahospital.我有一位在医院工作的姐姐。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。1.Ihaveasisterwhoworksinahospital.我有一位在医院工作的姐姐。2.Ihaveasister,whoworksinahospital.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。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。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。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。（不只一位姐姐）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。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。（不只一位姐姐）（只有一位姐姐）3.Allthemagazinesherewhichhavebeautifulpictureswerewrittenbyhim.3.Allthemagazinesherewhichhavebeautifulpictureswerewrittenbyhim.里面有漂亮图画的那些杂志是他写的。3.Allthemagazinesherewhichhavebeautifulpictureswerewrittenbyhim.里面有漂亮图画的那些杂志是他写的。4.Allthemagazineshere,whichhavebeautifulpictures,werewrittenbyhim.3.Allthemagazinesherewhichhavebeautifulpictureswerewrittenbyhim.里面有漂亮图画的那些杂志是他写的。4.Allthemagazineshere,whichhavebeautifulpictures,werewrittenbyhim.所有的杂志都是他写的，里面都有漂亮的图画。3.Allthemagazinesherewhichhavebeautifulpictureswerewrittenbyhim.里面有漂亮图画的那些杂志是他写的。4.Allthemagazineshere,whichhavebeautifulpictures,werewrittenbyhim.所有的杂志都是他写的，里面都有漂亮的图画。（杂志有带图画和不带图画两类）3.Allthemagazinesherewhichhavebeautifulpictureswerewrittenbyhim.里面有漂亮图画的那些杂志是他写的。4.Allthemagazineshere,whichhavebeautifulpictures,werewrittenbyhim.所有的杂志都是他写的，里面都有漂亮的图画。（杂志有带图画和不带图画两类）（杂志只有一种）1.Thefamousbasketballstar,____isanAmerican,cametoChinayesterday.2.Inthosedays,sheusedtogotoMrblack,with_____shehadawonderfultime.3.Iboughtacaryesterday,_____costmealot.Fillintheblankswithproperrelativewords.1.Thefamousbasketballstar,____isanAmerican,cametoChinayesterday.2.Inthosedays,sheusedtogotoMrblack,with_____shehadawonderfultime.3.Iboughtacaryesterday,_____costmealot.whoFillintheblankswithproperrelativewords.1.Thefamousbasketballstar,____isanAmerican,cametoChinayesterday.2.Inthosedays,sheusedtogotoMrblack,with_____shehadawonderfultime.3.Iboughtacaryesterday,_____costmealot.whomFillintheblankswithproperrelativewords.who1.Thefamousbasketballstar,____isanAmerican,cametoChinayesterday.2.Inthosedays,sheusedtogotoMrblack,with_____shehadawonderfultime.3.Iboughtacaryesterday,_____costmealot.whichwhomFillintheblankswithproperrelativewords.who4.Xi’an,______Ivisitedlastyear,isaniceoldcity.5.HewillcometoseemenextJuly,_____hewon’tbesobusy.6.Theschool,_____Ioncestudied,wasbuiltthirtyyearsago.4.Xi’an,______Ivisitedlastyear,isaniceoldcity.5.HewillcometoseemenextJuly,_____hewon’tbesobusy.6.Theschool,_____Ioncestudied,wasbuiltthirtyyearsago.which4.Xi’an,______Ivisitedlastyear,isaniceoldcity.5.HewillcometoseemenextJuly,_____hewon’tbesobusy.6.Theschool,_____Ioncestudied,wasbuiltthirtyyearsago.whichwhen4.Xi’an,______Ivisitedlastyear,isaniceoldcity.5.HewillcometoseemenextJuly,_____hewon’tbesobusy.6.Theschool,_____Ioncestudied,wasbuiltthirtyyearsago.whichwherewhen7.Johnsaidhe’dbeenworkingintheofficeforanhour,________wastrue.8.____weallknow,heisgoodatEnglish.7.Johnsaidhe’dbeenworkingintheofficeforanhour,________wastrue.8.____weallknow,heisgoodatEnglish.which7.Johnsaidhe’dbeenworkingintheofficeforanhour,________wastrue.8.____weallknow,heisgoodatEnglish.AswhichConclusion1.as和which在引导非限制性定语从句时,as和which可代替整个主句，相当于andthis或andthat。这两个关系代词都可指代主句所表达的整个意思,且在定语从句中都可以作主语和宾语。2.as和which引导非限制性定语从句的不同之处在于：(1)as引导的定语从句可置于句首,而which引导的定语从句不可放在句首。(2)as代表前面的整个主句并在从句中作主语时,从句中的谓语必须是系动词;若从句中的谓语为行为动词，则从句中的关系代词只能用which。另外,as引导非限制性从句,常带有“正如”的意思。1.Alicereceivedaninvitationfromherboss,_____cameasasurprise.2.Theweatherturnedouttobeverygood,_____wasmorethanwecouldexpect.3.___isexpected,theEnglandteamwonthefootballmatch.Practice1.Alicereceiv