②当从句中的介词提前,构成“介词+关系代词”结构时。
We live in an age in which more information is available with greater ease than ever before.
我们生活在一个信息比以前更容易获得的时代。
3.as引导的定语从句
(1)as 可以引导限制性定语从句,常用于“so/such/the same+先行词+as ...”结构中。
Such machines as are used in our workshop are made in China.
像在我们车间使用的机器是中国制造的。
—————————————————————————————————————which引导定语从句代指前面整句话内容时只能位于主句之后。
He kept lying to me, which annoyed me greatly.
他总是对我说谎,这事使我很恼火。
————————————————————————————————————— (2)as 也可以引导非限制性定语从句,定语从句说明整个句子,可放在主句之前、之中或之后。
常用的这种类似插入语的句式有:as the saying goes, as is said above, as is mentioned above, as often happens, as is often the case, as is reported in the newspaper等。
“You can't judge a book by its cover,” as the old saying goes.
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