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课件网) 定语从句定义： 定语从句（形容词性从句），在句子中起定语作用，修饰一个名词或代词，有时也可修饰一个句子。被修饰的词叫做先行词，引导定语从句的词叫做关系词（关系代词和关系副词）。关系词的作用：一是放在先行词与定语从句中间起连接作用；二是代替先行词在从句中充当一定成分。 关 系 词 一、限制性与非限制性定语从句 (一)限制性定语从句对先行词起修饰限制作用;非限制性定语从句对先行词起补 充说明作用。非限制性定语从句中,先行词与定语从句往往有逗号隔开。如: He has two sons,who work in the same company.(He has only two sons.) 他有两个儿子,他们在同一家公司上班。 He has two sons who work in the same company.(Perhaps he has more than two sons.) 他有两个在同一家公司上班的儿子。 限制性定语从句与非限制性定语从句 限制性定语从句与非限制性定语从句的区别 选择关系代词还是关系副词的关键 分析从句，如果从句缺主语或宾语等就用关系代词，缺状语就用关系副词或考虑“介词＋which/whom” 尤其先行词是表时间的time, day等和表地点的place, house等时，一定要注意分析从句的结构，如果缺少主语或宾语时，关系词应该用which或that, 缺少时间状语或地点状语时，才能用when或where，试比较： I’ll never forget the days when we worked together. I’ll never forget the days which/that we spent together . His father works in a factory where radio parts are made. His father works in a factory which/that makes radio parts. This is the place where he works.(关系词作状语，=in the place,要用where) This is the place which he visited.(关系词作宾语，=the place,要用which) This is the reason why he was late. This is the reason which he gave. 特例2.当关系代词as与which引导非限制性定语从句,修饰主句内容时,若as与which 作主语,则从句的谓语动词用单数形式。 如: Great changes have taken place in China,as is known to all. 众所周知,中国发生了巨大的变化。 He has passed the college entrance examination,which makes his parents quite happy. 他通过了高考,这让他的父母很高兴。 考点五 定语从句中的主谓一致
