degree.

4. In 1951 Dr Wang founded his own company where/ in which computers were made.

5. Dr Wang died in 1990 when IT was developing rapidly all over the world.

二．"介词+关系代词"引导定语从句的用法。

【关键点】关系代词whom, which前介词的选择由先行词的习惯搭配或后半句动词的搭配而决定。

1. The speed at which light travels is 300000km per second.(由先行词的习惯搭配决定)

（at the speed of）

2. This is the teacher from whom I borrow the book. (borrow from)（动词词组）

3. Don't bring the children to see the animals of which they are afraid. (be afraid of)

【拓展】关系副词引导定语从句可以换成"介词+which"结构。

1. This was a time when you had got to have a passbook to live in Johannesburg．

　This was a time at which you had got to have a passbook to live in Johannesburg．

2. Wang An spent 3years in Harvard University where he studied applied physics.

Wang An spent 3years in Harvard University in which he studied applied physics.

3. That was the reason why I had to go to hospital.

That was the reason for which I had to go to hospital.

【随堂练习】

1. 找出下列各句中定语从句的引导词，并指出其功能

1）I still remember the days when we studied in middle school. (状语)

2）I still remember the days which we spent in the island in our holidays (宾语).

3）The factory where my father works is very big.(_________)

4）The factory which is near my home is very big.(__________)

5）The factory which we visited is very big. (___________)

6）The factory whose name is HD is very big.(__________)

2.用合适的关系代词或关系副词填空 ：

1 This is the town ___________ I spent my childhood.

2 I will never forget the day __________ New China was founded.

3 The school ___________ he studies was built last year.

4 The reason __________ he didn't come to class is that he was ill.

5 I don't like the way ___________ he talks.

6 This was a time __________ you had got to have a passbook to live in the city.