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定语从句关系词分为关系代词(that, which, who, whom, whose)和关系副词(when, where, why)。 本课我们主要介绍关系代词的用法。 that, which, who引导的定语从句 that, which和who是定语从句中重要的引导词。下面的例句是由that, which和who引导的定语从句。请仔细观察，补全结论部分所缺内容。 e.g. A plane is a machine?that?can fly.?? (作主语，指物) That is the hotel?that?I know.?? (作宾语，指物) Who is the man?that?is reading a book over there?? ?(作主语，指人) The girl?that?we saw yesterday is Sara’s sister.? ?(作宾语，指人) 【结论】 that在从句中作主语或宾语，可以指___， 也可以指______。 温馨提示：关系代词在定语从句中作宾语时可以省略。 人 物 e.g. China is a country which / that has a long history. This is the book which / that my mother bought me yesterday.? 【结论】 which引导的定语从句修饰的是____（人/物），which在定语从句中可以作___语也可作___语。 which在定语从句中作主语或宾语时均可由_____代替。 物 主 that 宾 e.g. The man who / that is standing by the door is her brother. I like the boy who / whom / that I met at the par