限制性定语从句与非限制性定语从句的区别限制性定语从句提供有关主语或宾语的重要信息,起限定作用,与被修饰部分的关系紧密,如果省略该从句会使主句语义表达不完整
例如:Thisistheverypersonthatiswantedbythepolice
Heisthemanwho/thatlivesnextdoor
ItwasameetingwhoseimportanceIdidnotrealizeatthetime
非限制性定语从句只是用来对被修饰部分作补充性的说明,与先行词关系比较松散,先行词与从句间可以用逗号隔开,从句可略去:Hewillnotbeabletospendtheholidaywithhisfamily,whichisabigannoyancetohim
Theminister,whoistovisitouruniversity,issaidtobeaQinghuaUniversitygraduate
Thebook,whichyoursisterboughtyouinXinhuaBookstore,isveryusefulinimprovingyourspokenEnglish
Thebusinessman,whosesuitcasehasbeenfoundbyastranger,hasleftforBeijing
如果定语从句的先行词是专有名词或是带有形容词性物主代词(my,his,etc)或形容词性指示代词(this,that,etc)作限定词的名词词组,其后的定语从句通常为非限制性的
例如:TheThames,whichisnowcleanenoughtoswimin,waspollutedforoverahundredyears
Mymother,whohasbeenonavisittoAustralia,willflybacktomorrow