1、when 和 where 引导定语从句的用法定语从句既是英语语法的一个重点，同时又是一个难点。说它是难点，主要难在两点上：一点是如何正确判断什么样的汉语句子要译为英语的带定语从句的复合句；另一点是定语从句的引导词较多(包括关系代词 who, that, which, as 和关系副词 when, where, why)，而且其用法也较复杂。那么到底什么情况下用 when 和 where 来引导定语从句呢？它们又该怎么用呢？下面就举例说明：一、when：当主句中的先行词(即主句中被后面定语从句修饰的词)是表示时间意义的名词时，它只能作定语从句的时间状语，放在定语从句句首。如果定语从句的引导词是作
2、该定语从句的主语或宾语，则要改用关系代词 that 或which 来引导。例如：The days when we used foreign oil are gone. 我们用洋油的日子一去不复返了。Ill never forget the day when I was born. (=Ill never forget my birthday.) 我永远不会忘记我出生的日子。It happened in November when the weather was wet and cold. 这事发生在天气又湿又冷的十一月。In the years that (which) followed, M
3、arx kept on studying English and using it. 在这之后的几年中，马克思继续学习和使用英语。(that 作定语从句“that followed“的主语)The day (that) I always remember in all my life is my birthday. 我一生中最难忘的日子是我的生日。(that 作定语从句“that I always remember in all my life“的宾语，that 可以省略) 二、where：当主句中的先行词是表示地点意义的名词时，它只能作其所在的定语从句的地点状语，放在定语从句的句首。如果定语
4、从句的引导词作该定语从句的主语或宾语时，也要改用关系代词 that 或 which 来引导。例如：This is the room where(in which)I lived last year. 这就是我去年住过的房间。Is this the classroom where(=in which) the old worker is going to make/give us a report? 这就是那位老工人要给我们做报告的教室吗？Lets look for a place where we can swim. 咱们找一个可以游泳的地方吧。The building that is being built over there will be a new hospital. 正在那边建的楼房将是一家新医院。(引导词 that 作定语从句“that is being built over there“的主语)That is the factory (that) they visited last month. 那就是他们上个月参观过的工厂。(引导词 that 作定语从句“(that) they visited last month“的宾语，that 可以省略)
