1、Section Grammar Grammar 1定语从句(3)画出下列句子中的定语从句，并体会其用法。1They did not have enough staff,and the laboratory in which they worked had poor air quality.2They tried to think of a plan by which they could complete their task ahead of time.3I met a man with whom I used to work.4Well go to see the famous singe
2、r about whom we have talked.【自主发现】1关系代词在定语从句中作介词的宾语时，从句常由“介词_”引导。2若介词放在关系代词前，关系代词指_时只能用which；关系代词指_时只能用whom。which/whom物人“介词关系代词”引导的定语从句中的关系代词一般为which(指物)和whom(指人)，且关系代词不可省略。一、介词的选择在这种结构中介词的选择非常关键，可以遵循以下原则：1根据先行词来选用介词。The reason for which I came here is that I want to get your help.(for the reason)我来
3、这儿的原因是我想得到你的帮助。The farm on which I once worked has taken on a new look.(on the farm)我曾经工作过的农场呈现出一派新景象。2根据定语从句中的谓语动词或形容词来选用介词。The person to whom I spoke just now is my English teacher.(speak to)我刚才与之讲话的那个人是我的英语老师。China is a beautiful country，of which we are greatly proud.(be proud of)中国是个美丽的国家，我们为之感到
4、非常骄傲。3根据句子的意思确定介词。This is the pilot for whom I bought a camera.(for the pilot)这个就是我给他买照相机的飞行员。二、介词的位置1关系代词which/whom在从句中作介词宾语时，可与介词一起放在先行词和从句之间；为了使关系代词紧跟它所修饰的词，也可将介词放在从句中有关动词的后面，此时作宾语的which/whom也可用that或都省略。The man to whom I talked is my friend.和我谈话的人是我的朋友。The man whom/that I just talked to is my fri
5、end.刚刚和我谈话的人是我的朋友。2有些动词介词的固定搭配不可将介词提前。This is the book which/that Im looking for.这是我正在找的书。三、“介词十关系代词”的特殊用法有时“介词关系代词”前会出现不定代词(all,both,none,neither,many,few,the rest 等)、数词(分数、百分数等)及“the最高级/比较级”等，用来表示部分、数目等意义。I live in the room,the windows of which(of which the windows/whose windows)face south.我住在一个窗户
6、朝南的房间里。Last week,only two people came to look at the house，neither of whom wanted to buy it.上周只有两个人来看了房子，但是没有一个想要买的。The football team has 15 members,the oldest of whom is 25 years old.这支足球队有15名队员，其中最大的25岁。名师指津(1)当“介词关系代词”在定语从句中充当时间、地点、原因状语时，可分别用when,where,why替换。Ill never forget the day on which(when
7、)I joined the army.我永远也忘不了我参军的那一天。(2)关系代词that在从句中作介词宾语时，介词不能放在that的前面，只能放在有关动词的后面。The city that she lives in is very far.她居住的城市非常远。(3)关系代词whose与其修饰的名词可以在从句中一起作介词的宾语。The boss in whose company my brother works is a very kind person.我弟弟工作的这家公司的老板是个非常和善的人。用适当的介词填空I wanted to find someone _ whom I could discuss books and music.Ill never forget the day _ which she said goodbye to me.He referred me to some books _ which I am not very familiar.The tower _ which people can have a good view is on the hill.The man _ whom I spoke on the phone last night is very good at wrestling.withonwithfromto
