定语从句(Ⅱ)

1.What is the name of the town where we stayed last night?
2.Oct.1,1949 was the day when the Peple’s Republic of China was founded.
3.I don’t know the reason why she looks unhappy today.
4.The school in which he once studied is very famous.
5.We’ll go to hear the famous singer about whom we have often talked. 
由以上1～4例句可以看出，若定语从句所修饰的先行词在定语从句中作地点、时间、原因状语时，常用关系副词或“介词＋which”引导定语从句，并在定语从句中作状语；另外，当关系代词在定语从句中作介词宾语时，从句常由“介词＋which/whom”引导，如例5。 
1.where表示地点，只能跟在表地点或场合的名词后，在定语从句中只能作地点状语。注意：
where不在从句中作主语或宾语。
It’s one of the few countries where people drive on the left.
Think of a place where we can go for dinner.
2.when表示时间，只能跟在表时间的名词后，在定语从句中只能作时间状语。
Oct.1,1949 was the day when the People’s Republic of China was founded.
Do you remember the day on which you joined our club?
3.why表示原因，通常跟在reason后引导定语从句，在定语从句中只能作原因状语。
I don’t know the reason why she looks unhappy today.
This is the reason why(＝ for which) he cried.
4.介词＋which/whom结构
(1)当关系代词在定语从句中作介词宾语时，从句常由“介词＋which/whom”引导；关系副词有时也可以被此结构代替。
Tomorrow I will bring here the magazine (that/which) you asked for.
＝Tomorrow I will bring here the magazine for which you asked.
(2)关系词whose常用“the＋名词＋of which”或“of which＋the＋名词”结构来代替。
The classroom whose door is broken will soon be repaired.
The classroom the door of which is broken will soon be repaired.
The classroom of which the door is broken will soon be repaired.
(3)“介词＋which/whom”前可有some，any，none，both，all，neither，most，each，few
等代词或者数词，表示部分与整体的关系。
He loved his parents deeply，both of whom are very kind to him.
In the basket there are quite many apples，some of which have gone bad.
There are forty students in our class in all，most of whom are from big cities.
【注意】1.含有介词的动词短语一般不拆开使用，如：look for，look after，take care of等。
This is the watch which/that I am looking for.(√)
This is the watch for which I am looking.(×)
2.若介词放在关系代词前，关系代词指人时用whom，不可用who或者that；指物时用which，不能用that。
The man with whom you talked is my friend.(√)
The man with that you talked is my friend.(×)
【支招】
如何判断关系代词与关系副词
用关系代词还是关系副词完全取决于关系词在从句中所作的句子成分，若关系词在从句中作状语，就必须要求用关系副词或者是介词加关系代词；若作宾语、主语或表语，则要求用关系代词。
(1)I’ll never forget the days I worked together with you.
(2)I’ll never forget the days I spent in the countryside.
在句(1)中，要填的关系词在定语从句中作时间状语，所以填when；在句(2)中，要填的关系词在定语从句中作spent的宾语，所以应填that或which。