你说的是这种结构吧 ?
some of...
many of...
one of...
most of...
all of...
当of后面跟的是名词一定要加上这些词:
the/指示代词(this that these those)/形容词性物主代词(my/your/his/her...)
例如:All of the students like watching TV.
Some of my friends come from China.
当of后面跟的是代词的时候就什么都不加了
比如:Many of us went to the mountains yesterday.
有很多种情况,自己百度
这取决于后面的名词吧