关系副词包括when, where, why,它们在定语从句中做状语,相当于介词+which。
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when
when既可以引导限定性定语从句,又可以引导非限定性定语从句,它在从句中做时间状语,相当于表示时间的介词in, at, on, during加which, 比如:He could remember the day when he first went to school.(when=on which)他还记得他第一次上学的那一天。The situation is when farmers have to sell their produce at low prices after harvest, when supplies are greatest. 目前的情况是,农民不得不在收获后以低价出售他们的产品,这时的供应是最大的。
另外注意先行词是occasion时,常用when。比如:It is a rare occasion when a president can sign a bill he knows will save American lives. 总统能签署一项他知道会拯救美国人生命的法案是罕见的。
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where
where既可以引导限定性定语从句,又可以引导非限定性定语从句,它在从句中做地点状语,相当于表示地点的介词in, at, on等+which,比如:The area where the explosion occurred was closed off by police. (where=in which)爆炸发生的地方被警察封锁起来了。They wanted to build a country that included many religions, where citizens were free to follow their own beliefs. 他们想要建立一个包含多种宗教的国家,在那里公民可以自由地遵循自己的信仰。
另外注意where不是只能跟在表示地点的先行词后边,condition, situation, point, cases等词,虽然不表示具体地点,但后边仍然用where引导定语从句,比如:This is one of those cases where I find myself wondering where to begin. 这是我不知道从哪里开始的情况之一。
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why
why只能引导限定性定语从句,不能引导非限定性定语从句,它用在先行词reason的后边,相当于for+which,比如:There’s a reason why (=for which)women don’t read this stuff; it’s not funny.妇女们不读这种东西是有原因的:它并不逗趣。
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