little/ a little修饰不可数名词，后加不可数名词单数。
few/ a few修饰可数名词，后加复数名词
little/ few 表示【否定含义】几乎不、几乎没
I have few friends here.【我这儿几乎没朋友。】
There is little water in the glass.【杯子里几乎没水。】
a little/ a few 表示【肯定含义】有一点、有一些
I have a few friends here.
There is a little water in the glass.
