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从句（含分句）含有动词的一组单词，一个从句（或分句）可能是完整的句子，也可能只是句子的一部分。 (状语从句（副词从句） …

- - - - :check:如果关系代词是宾语，且为who, which, that则可以省略；
        :red_cross:如果关系代词是主语，则不能省略。
        比较：I found the key (that) I had lost.
        This is the key that opens the front door.
        :check:在表示时间的常见词语后面可省略when。
        例：the day I arrived, the year I worked in Egypt.
        :check:在somewhere, anywhere, everywhere, nowhere, place后面可省略where
        例：somewhere we can get a drink.
        :check:在reason后面可省略why
        例：I never found out the reason (why) she left.
        :check:在way后面的in which也能省略。
        如：I didn't like the way (in which) he spoke to me.
    - - ①whose+名词=名词+of which☞指句子前面所提及的人/物
        比较：A huge amount of oil was spilled, the effects of which are still being felt.
        A huge amount of oil was spilled, whose effects are still being felt.
        ②of which=that/which...of
        比较：The school that/which she is head of is closing.
        The school of which she is head is closing.
        ③ among which
        就是在关系代词which前面加了介词among。
        例：people were also fascinated by a number of differing cultures，, among which were Confucianism, Buddhism, and Taoism from China, and Christianity and Islam from foreign countries.