定语从句知识应该掌握到什么程度Learning aims: 1. 关系副词where/when/why引导的定语从句2. 介词+which/whom 引导的定语从句1.关系副词引导定语从句在定语从句中，关系副词主要有3个：when, where和why.1）when 在定语从句中表时间，作状语，其先行词往往是表示时间的名词，如：time, day, season, age, occasion 等。
I can’t forget the night when I came to the farm.翻译：__________________________________________________2)where在定语从句中表示地点，作状语，其先行词通常是place, city, town, factory,table, village, house等表示地点的名词 situation, case, condition, point等表示抽象意义的名词。
The factory where his father works is in the west of the city.翻译：____________________________________________________The country is in the situation where a war will break out at any time.翻译：____________________________________________________3) why在定语从句中表示原因，作状语，先行词一般是reason.That is the reason why I did so. 翻译：___________________________I don’t know the reason why he didn’t come to school yesterday.翻译：_____________________________________________________【注意】1)并非先行词表示时间、地点或原因时,引导词就用when, where 或why;若定语从句中不缺状语而缺主语或宾语则须用which或 that引导定语从句。
I’ll never forget the days______ we worked together.I’ll never forget the days ______we spent together.Do you know the reason ______he failed in the exam this timeThe reason _____he gave me was reasonable.2) when, where, why,引导的定语从句可用“介词+which”来替换。
其介词可根据先行词和定语从句中的谓语动词来判断。
A.when相当于at/in/on/during等+which.The date on which he joined the Party was July 1，1984.翻译：B.where相当于at/in/on/等+whichThe house in which he lived is a library now.翻译：C.why相当于for+which.Is that the reason for which he was absent from class翻译：2. 介词+关系代词（which, whom）引导的定语从句1) 介词+which 在定语从句中充当时间，地点，原因状语，相当于when, where, why.(上边已经讲述)2) 介词+which/whom, 关系代词作介词的宾语，这是我们学习定语从句的重点，也是高考的常考点。
which指物，whom指人。
在这种结构中，介词的选择非常关键, 可根据定语从句所修饰的名词或代词来选择介词。
也可根据从句的相关动词来选用。
This is the professor from whom I have learnt a lot.翻译：Have you see the pen with which I write my homework.翻译：In the dark street, there wasn’t a single person to whom she could turn for help.翻译：【注意】在日常英语中通常把介词放在从句的句末，省略关系词which/whomThis is the professor (whom/that) I have learned a lot from.This is the camera (which/that) he often takes photos with.【学法点拨】1）“介词+关系代词”引导定语从句时，介词的选取必须遵循“一先；二动；三意义”的原则。
即：a.根据先行词的搭配而定；b.根据定语从句中谓语动词的搭配而定；c.根据整句话的意义而定。
2)介词+关系代词引导定语从句时，介词的选择应注意几个问题：a.有的介词时定语从句中词组的固定搭配拆开的结果，用什么介词由从句的动词决定。
He is the boy who / whom I was talking to. =He is the boy to whom I was talking.翻译：b.有的介词是根据句意添加上去的，即用什么介词由先行词决定。
He employed 30 men, of whom 12 were from his hometown.翻译：c.定语从句中的词组若是十分密切的固定搭配，一般不拆开。
The baby who/whom my sister takes care of is very lovely.翻译：【误区警示】：当定语从句的动词和介词是不可分割的固定搭配时，介词不能放到关系介词之前。
当堂检测1. —We’ll take the conditions into careful consideration you have attachedto this contract.—Thanks. Hope for further cooperation.A．as B．which C．where2. Do you remember a certain occasion ______ you were in trouble and at that momentI gave you a hand.A. whereB. whichC. whyD. when3. There are moments_______ we remember our childhood days with fondness, embarrassment, regret or mixed feelings.A. whenB. thatC. whichD. Where4. Leave him a note at the reception desk, he will learn how to find you.A. whichB. from whichC. with whichD. on which5. -----How about your job-hunting-----No luck．Now，I’ve reached the stage________I don’t care what I do．A. which B．where C．when D. that6. More teens are smoking in Beijing, ______ the number of primary and middle school students picking up the habit has more than doubled from previous years.A. whichB. whenC. whereD. that7. I can think of many cases ________the media have a strong effect on young men.A. whyB. whereC. asD. which8. After graduation she reached a point in her career ___ she needed to decide what to doA. thatB. whatC. whichD. where9. Judging from his face_______ there was a confident smile, we knew that he didn’t lose heart.A. in whichB. from whichC. by whichD. on which, I guess we’d better fix a navigational（导航仪）to the car_____ we can find our way easily.A. which which which11. In English class, our teacher often creates an environment ______we are giventhe opportunity to solve problems ourselves.A. when D. that12. A turning point for the continuously high housing price won’t appear suddenlybecause there must be a certain process______ many factors lead to the change.A. whichB. whatC. whereD. that13. We have spotted the location, ______we thought is the site of Emperor Qin Shihuang.A. thatB. whatC. which14. ---When did the young man save you----January 1st, 2000, the first day of the new century, _______I can never forget.B which15. I've read all the books _______you gave me.A. whichB. themC. whatD. that16. There isn't much _______I can do.A. whatB. whichC. thatD. how17. Tell us about the people and the places _______are different from ours.A. thatB. whoC. whichD. whom18. The TV play I watched last night is the best one _____I have watched this year.A. whichB. whatC. whoseD. that19. Last Sunday they reached Qingdao, _______a conference was to be held.A. whichB. thatC. whenD. wherethis the museum_______ you visited the other dayA. thatB. whereC. in whichD. the onebegan to work in Beijing in the year _______New China was founded.A. whenB. thatC. whichD. where22. There is no difficulty _______can't be overcome in the world.A. thatB. whichC. whoD. what23. Who is the person _______is standing at the gate of Beijing Tourism TowerA. whoB. thatC. whichD. whom定语从句学案答案1.1）我不能忘记我来农场的那晚。