when、where引导的定语从句前有介词的情况 |
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But it was a time when there were many great philosophers. 1.when=during which 2. 看语法书中说when和where前也可以有介词,when前可以与from、since、after等引导定语从句,where前可以与from引导定从: A. She went to America two years ago,since when I haven't heard from her any more. 首先把这个句子还原成并列句: She went to America two years ago, and since then I haven't heard from her any more. 时间副词指代two years ago. 这是二个并列分句表达的信息同等重要。但说话人为了突出第一分句的信息,第二分句就用关系副词when取代时间副词then, 同时去掉并列连词and, 第二分句就成了一个非限制性定语从句,主句表到重要信息,从句表达次要信息,起补充说明的作用。when固然可以作状语,但其意义指代的是两年前那个时间,而定语从句的谓语表示的是自从两年前到现在这段时间,因此必须用介词since。when也可以改为which time. since which time。。。 B. She climbed up to the top of the hill,from where she could have a good view of the whole town. 和上一个句子类似,如果是并列句的话,则为: She climbed up to the top of the hill,and from there she could have a good view of the whole town. 为了突出第一分句,不想让第二分句喧宾夺主,将地点副词改为关系副词,去掉并列连词and,就得到一个非限制性定语从句,表示次要信息。where指代the top of the hill. 这个地点是向别处看的位置。而不是看山顶,即从山顶往下看,可以清楚的看到山下的城镇。因此必须用form。 where可以改为which place,from which place。。。 |
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