学习定语从句应注意的问题 — 关系代词which和as引导非限制性定语从句的区别。--打印文章

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学习定语从句应注意的问题 — 关系代词which和as引导非限制性定语从句的区别。

作者：frog 文章来源：本站原创点击数更新时间：2010-4-6 22:44:50 文章录入：frog 责任编辑：frog

    (1) 关系代词which引导的非限制性定语从句一般放在句中，而不放在句首。例如：
    ________ is known to everybody, the moon travels round the earth once every month.
    A. It             B. As
    C. That           D. What
    简析： as is known to everybody意思是"人人都知道；众所周知"，且定语从句位于句首。答案为B。
    (2) as引导的非限制性定语从句常常和such, so, the same等连用，这时，as指代先行词。例如：
    Do you want to buy the same radio ________ was shown on TV?
    A. what            B. as
    C. which           D. that
    It was such a difficult problem ________ few of the students could work out.
    A. that           B. which
    C. as              D. so
    简析： such...as, so...as和the same...as中的关系代词as代替先行词，在定语从句中可作主语、宾语、表语等。如第一个句中的as在定语从句中作主语；第二个句中的as在定语从句中作宾语。答案分别为B和C。
    (3) as引导非限制性定语从句时，很多情况下保留着原意"像……一样"，这时，as常常指代主句的整个内容。例如：
    It's wrong to think foreign languages useless, ________ quite a few people did before.
    A. which            B. as
    C. such as         D. that
    简析：此句要表达的意思是"认为外语无用是错误的，就像过去人们认为的那样"。as"像……一样"，指代前面主句的整个内容。

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