1、表示“比……更多”
此时more为many或much的比较级，表示数量，后接名词。如：
I made more mistakes than you. 我犯的错误比你多。
Last year there were more births than deaths. 去年的出生人数多于死亡人数。
He’s got more money than the rest of us together. 他的钱比我们大家的加在一起的总数还多。
注：若more受much或many的修饰，则应分别与不可数和可数名词连用。如：
His car cost much more money than mine. 他的小汽车所花的钱比我的多得多。
There are many more people than we expected. 比我们想象的人要多得多。
2、表示“比…更”
此时more后接多音节形容词或副词，构成比较级，表示对两者进行比较。如：
He is more careful than the others. 他比其他人更仔细。
Travelling by train is more relaxing than driving. 乘火车旅行比开汽车轻松得多。
This company is more concerned with quality than with quantity. 这家公司对质量比对产量更关心。
3、表示“与其说……不如说”
此时不是对两个对象进行比较，而是对同一个人或物在两个不同方面进行比较或取舍，此时不论形容词或副词是单音节、双音节还是多音节，一律用more…than…。如：
He is more lucky than clever. 与其说他聪明，不如说他幸运。
He was more frightened than hurt. 他伤倒不算什么，可受惊不小。
It is more grey than brown. 与其说它是棕色的，倒不如说是灰色的。
有时，more…than…比较的不是。
He is more (a) scholar than (a) teacher. 与其说他是位教师，不如说是位学者。