Many of the high school students are studying hard to enter Peking University，but only a few of them were lucky enough.
许多高中生努力学习想进北大，但只有几个人足够幸运。(many 修饰可数名词，表示“许多”，而a few也修饰可数名词，表示“几个”。)
Living in Shanghai for a few years，yet he has made few friends there.
虽然在上海生活了几年了，但是他没交到几个朋友。
(a few 与few都修饰可数名词，但是前者表示肯定，而后者表示否定)
There is little time left，but we still have much to do.
几乎没时间了，但是我们还有好多工作要做。(little修饰不可数名词，表示否定，意为“几乎没有”；much修饰不可数名词，意为“许多”)
There is only a little oil left but we still have many miles to travel to get there.
只剩一点油了，但是要到那儿我们还有数英里的路要走。(a little修饰不可数名词，表示“一点儿”；many修饰可数名词，意为“许多”)
