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eg,Who is the person that is teaching you English? (作主语)
The picture that we are looking for was drawn by a fifteen-year-old student.(作宾语，可省略)
Who，whom的用法：
二者都用于指人。Who 在定语从句中作主语、宾语、表语，whom 在定语从句中作宾语。
eg, He didn’t become a person who/that his father wanted him to be.(作表语)
He is the man who/that lives next door.(作主语)
I happened to meet the professor who/whom/that I got to know at a party.(作宾语，可省略)
I have many friends to whom I am going to send postcards.(作宾语，不可用who代替)
Which 的用法：
Which 一般指物，在定语从句中作主语、宾语。作宾语的关系代词which可以省略（放在介词后除外）。
Eg,The river which/that runs through the centre of the city brings us a lots of pleasure.
(作主语)
This is the book which/that you are looking for.(作宾语，可省略)
I will never forget the time in which we stayed together.(作宾语)
Whose 的用法：
Whose 一般指人，但有时也指物，在定语从句中作定语。
eg,He is the man whose car was stolen last night.(作定语)
Please pass me the book whose cover is green.(作定语)
2，常见的关系副词
关系副词在定语从句中作状语，一般不可省略
Where 的用法：
Where 指地点，在从句中作地点状语。它的先行词通常有place, factory,street, house, room, city, town,country 等。此时常用 form which，in which 等代替。
Eg，This is the city where I have worked for 20 years.
= This is the city in which I have worked for 20 years.
When 的用法：
When指时间，在从句中中作时间状语。他的先行词通常为 time，day，morning，night，week，year等。此时常可用in which, on which, at which, to which 等结构代替。
Eg，I shall never forget the days when we worked on the farm.
=I shall never forget the days on which we worked on the farm
Why 的用法：
Why 指原因或理由，在定语从句中作原因状语，它的先行词通常为 reason。