只用which
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只用which,不能用that作先行词的情况
(1)在介词提前到关系代词之前形成“介词+关系代词”结构来修饰表事物的先行词时, 关系代词必须用which.例如:
①The house in which we live is very large. 我们住的房子非常大.
②This is the reference book of which the teacher is speaking. 这就是老师正在谈及的那本参考书.
注意:如果介词不放在修饰事物的限定性定语从句的句首, which就可换为that, 例如:This is the question which/that we’ve had so much discussion about. =This is the question about which we’ve had so much discussion. 这就是我们已经多次讨论过的问题.
(2)先行词为“those+表事物的复数名词”时, 关系代词通常只用which而不用that.例如:
①Students should keep in mind those regulations which restrict their behavior. 学生应牢记那些规范自己的行为准则.
②A bookshop should deal with a variety of those best sellers which are newly published. 书店应该经营新出版的各种畅销书.
where定语从句修饰模糊地点
where引导的定语从句的先行词大多数情况下是表示地点的名词,但也有特殊情况.如果定语从句修饰point,situation,part,condition,activity,case,stage等表示模糊地点的词,关系词在定语从句中充当状语时,常用where 引导,意思是“到了某种地步,在某种境况中。