定语从句是中学阶段的语法重点，也是历年高考的热点。I.主语和谓语一致 1、关系代词在定语从句中The boy who is standing at the door is my son. 2、在one of the +复数名词+定语从句”结构中，复数名词是先行词，关系代词在定语从句中作主语，其谓语动词用复数形式。例如： This is one of the best books that have ever been written on the subject. 3、在“the only one of the +复数名词+定语从句”结构中，one 是先行词，关系代词在定语从句中作主语，其谓语动词用单数。例如： This is the only one of the best books that has ever been written on the subject. II.关系代词的省略 在限制性定语从句中，关系代词在定语从句中作主语时不能省略；作宾语时在口语中可以省略。在非限制性定语从句中，关系代词不能省略。例如： A plane is a machine that can fly. The finger (that )I put into my mouth was not the one (that)I had dipped into the cup. Abraham Lincoln, who led the United States through these years, was shot on April 14,1865. His mother, whom he loved dearly, died in 1818. III. 正确使用that 和which 1、that 指物，有时也可以指人,which 指物，不能指人。Which 可以引导非限制性定语从句，也可以放在介词后面，that 则不能。 例如： Who is the man that is reading the newspaper?(正) Who is the man which is reading the newspaper?（误） The room in which she lives is a large one.（正） The room in that she lives is a large one.（误） 2、先行词前面有形容词最高级，序数词next, last, very, any, little, no 等修饰时，用that 不用which引导定语从句。例如： This is the best film that I have seen.（正） This is the best film which I have seen.（误） 3、先行词是all, much, little, none等时，用that而不用which引导定语从句。例如： That’s all that I want to say.（正） That’s all which want to say.（误） 4、先行词是不定代词something, anything, anything, everything时，一般用that而不用which引导定语从句。例如： Is there anything that you want in this shop?（正） Is there anything which you want in this shop?（误） 注：当something表示具体的事物，重要的东西，重要的人物等确定意义时，它是名词，关系代词用that 或which均可。例如： There was the mysterious something which/that they had worked so hard to find: radium. 5、先行词是人和物时，要用that 而不用which/who引导定语从句。例如： He talked about some writers and books that were unknown to us all. （正） He talked about some writers and books which
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