1.influence意为“影响”或“感化”时,后面可接upon或on.
This example has great influence upon /on young people.
这个事例对年轻人有重大的影响.
2.区别下面两个句子：
Mike used to have great influence over that man.
Mike used to have great influence with that man.
前者用over表示一种权力,可控制人.后者用with,仅表示对那个人有影响力,只能暗中左右他.