1、of 表示整體與部分的關系：即用於“部分+of+整體(which, whom) ”結構。如： He went with a group of people, few of whom were correctly equipped for such a c limb. 他和壹隊人壹起去了，其中沒有幾個人配有進行這樣壹次登山的適當裝備。
The buses, most of which were already full, were surrounded by an angry crowd. 公***汽車大多數都已經擠滿了人，它們被憤怒的人群包圍著。
2、在下列情況下，壹般只用of whom和of which。
定語從句的主語是few, little, some, most, many, much等時，壹般只用of whom和of which。
In the room are lots of people, many of whom I don’t know. 房間裏有很多人，很多人我不認識。He has a lot of story-books, a few of which I have never read. 他有很多故事書，有幾本故事書我還從未看過。
3、定語從句的主語是數詞、形容詞的最高級時，壹般只用of whom和of which。如：The old man has three children, two of whom are college students and one of whom is a manager. 那個老人有三個小孩，其中兩個是大學生，另壹個是經理。
擴展資料：
which用作疑問代詞時,在特殊疑問句中用作賓語或主語。
which用作關系代詞,可引導限制性定語從句或非限制性定語從句,引導非限制性定語從句時which可以用整個主句作為其前行詞,相當於and that,有時還可引導不定式短語從句。
which, that
that和which都可引導定語從句,但以下情況引導定語從句的關系代詞只能用that不能用which:
1、當先行詞是all, everything, nothing, anything, little等不定代詞,或被first, last, only, few, much, some, any, no等詞修飾時,應該用關系代詞that,不用which。
2、當先行詞為形容詞最高級所修飾時,關系代詞用that不用which。
3、當並列的兩個先行詞分別表示人和物時,要用關系代詞that而不用which。
4.、在強調句型“It is〔was〕...that〔who〕...”中,只能用that,不能用which。
5、同位語從句除了用whether, what, why等引導外,通常還用that引導,但不用which。