
I know the boy who is running over there.
I know the boy running over there.
我认识正在那里跑步的男生。
That is picture which was painted by my daughter.
That is a picture painted by my daughter.
那一幅是我女儿的画作。
The notebook which is on the desk is mine.
The notebook on the desk is mine.
在桌上的笔记本是我的。
The girl who wore a white dress is very beautiful.
The girl wearing a white dress is very beautiful.
The girl in a white dress is very beautiful.
那位穿白衣服的女孩非常美丽。
The bus which was full of people was out of control.
The bus full of people was out of control.
那辆挤满人的公交车失控了。
I need a chair which I can sit on.
I need a chair to sit on.
我需要一把椅子坐。
sit 不及物动词,需要介词on;
I need a chair.
I can sit on a chair.

This is 【the house】.
My mother was born in 【the house】.
This is the house which my mother was born in.
This is the house in which my mother was born.
这个就是我母亲出生的房子。
This is the house in which my mother was born.
(此时which 不可省略,不能用that,in that指原因,避免误解)
which 是in的宾语;
What year were you born in?
In what year were you born?
介词后面要有名词,或代词,作宾语;
This chair is made of wood.
I am sitting on the chair.
This chair which I am sitting on is made of wood.
This chair on which I am sitting is made of wood.
我正坐着的这把椅子是木头做的。