介词提前的定语从句
关系代词which， whom在定语从句中作介词的宾语时， 从句可有：介词+ whichwhom 引出。如：
1、Great changes are taking place in the city which they live in .
Great changes are taking place in the city they live.
2、 The film which I’m speaking of is to be shown next week.
The film I’m speaking is to be shown next week.
3、This is the teacher whom I’ve learnt a lot from.
This is the teacher I’ve learnt a lot.
4、The man whom we sent the present to is a doctor of laws.
The man whom we sent the present is a doctor of laws.
5、The situation which we had got into was very dangerous.
we had got was very dangerous.
6、The policeman whom Mr Henry is talking with is a friend of mine.
关系副词引导的定语从句。
When 表示时间，其先行词往往是表示时间的名词（如time， day ， hour， year 等）。在从句中做时间状语。
I will always remember the day . I got the first prize I will always remember the day.where 表示地点，在定语从句中做地点状语。其先行词往往是表示地点的名词（如place， room， house， street， area等）This is the place. My mother was born This is the room . I lived This is the village. My father worked.why 引导定语从句，在从句中表示原因，做原因状语。其先行词一般为reason. I don’t know the reason she looks unhappy today.我不知道为什么她今天看上去不高兴The reason 他为什么那样说的理由是十分清楚的。
