Who is the man that called on you just now?

　　4.as引导限制性定语从句时，用于such...as,the same...as和as many/much...as结构中。如：

　　Such books as you bought are useless.

　　5.关系代词在定语从句中作宾语时可以省略，但作主语时不可省略。

　　6.定语从句中关系代词作主语时谓语动词的单复数形式要与先行词保持一致。但是如先行词为复数名词且被the one of,the only one of,the very one of,the right one of或just the one of修饰时，定语从句中的谓语动词用单数形式。如果只是one of修饰，谓语动词用复数形式。如：

　　He is one of those students who never finish work on time.

　　You have been the only one of the persons who has really influenced me.

　　二、关系副词

　　1.关系副词的一般用法列表如下：

关系副词 指代 先行词 所充当的成分 When 时间 时间名词 状语 Where 地点 地点名词 状语 Why 原因 reason 状语 　　1）We'll never forget the day when the People's Republic of China was founded.

　　2）The office where he works is on the second floor.

　　3）The reason why he didn't come was not made clear.

　　2.时间名词、地点名词和reason后的定语从句中关系词如果充当状语则从句分别用when,where和why引导；如果是作主语或宾语，则用that或which引导其从句。如：

　　1）I'll never forget the day that I spent in the country.（that作宾语）

　　2）They worked in a factory that makes radio parts.（that作主语）

　　3）The reason that he gave me why he didn't attend the meeting is that he was badly ill.（that作宾语）

　　3.where引导定语从句与引导地点状语从句的区别在于其前面有没有先行词。前面有先行词则是定语从句，无先行词则是状语从句。如：

　　1）We will be shown around the city：schools,museums,and some other places,where other visitors seldom go.(where引导定语从句)

　　2）The famous scientist grew up where he was born and in 1930 he came to Shanghai.(where引导状语从句)

GrammarⅡ　Defining relative clauses: of whom,in which

of whom,in which等引导的关系从句

　　1.在定语从句中作宾语的有whom，which，that 三个关系代词，但能在定语从句中作介词的宾语的只有whom和which，可直接置于介词之后构成"prep.+whom/which"这一结构。引导词whom（指人）,which（指物）。如：

　　This is the student of whom we are proud.（不能用who来代替）

　　He went to Australia in 1949,after which I never heard from him.（不能用that来代替）

　　但是，当介词位于定语从句末尾时，可用that/which（指物）；that/whom/who（指人）作介词的宾语，而且作介词宾语的关系代词常常省略。如：

　　This is the hero(that/who/whom) we are proud of.

　　This is the pen(that/which) I wrote the letter with.

　　2.如何选定这一结构中的介词呢？有下面三种情况：

根据从句中动词或形容词的习惯搭配。如：