2011大學英語四級考試語法輔導之從句
    從句
    I 定語從句
    1. 先行詞為all， anything， something， nothing， everything， much， little， none等不定代詞時，關系代詞一般只用that，不用which。在大多數(shù)情況下that可以省略。
    Please tell me everything （that） you know about the matter.
    That’s all （that） we can do at the moment.
    2. as引出的限制性定語從句
    在such … as的結構中as可作關系代詞，引出限制性定語從句。有時和same連用，在從句中可作主語、賓語或表語等。
    Such people as were recommended by him were reliable.
    I’ve never seen such a talented young man as he is.
    I have the same trouble as you （have）。
    3. as引出的非限制性定語從句
    as可作關系代詞引出非限制性定語從句，代替整個主句，通常譯為“（正）如…一樣”，“（正）象…一樣”等。as引導的從句一般用逗號與主句隔開，可以位于主句的前面、中間或后面。
    I live a long way from work， as you know.
    She did not， as her friend had feared， break down.
    As is generally accepted， economic growth is determined by the smooth development of production.
    4. 分隔式定語從句
    定語從句一般緊跟在先行詞之后，但有時會被其他句子成分與先行詞隔開，從而構成分隔式定語從句。
    The days are gone when power politics worked.
    A new teacher will come tomorrow who will teach you French.
    5.介詞+關系代詞（which/whom等）引出的定語從句
    如果關系代詞（which/whom等）在定語從句中作介詞的賓語，那么這個介詞可以提到從句前，構成“介詞+關系代詞（which/whom等）+定語從句”。在這種結構中關系代詞不可以用that。
    This is a subject about which we might argue for a long while.
    The four travelers with whom I shared the room were pleasant people.