few,a few,little,a little的用法?

few,a few后加可数名词；little,a little后加不可数名词.
few,little表示很少数的,几乎没有
a few,a little表示有一些,几个
EG:
1、Few of my acquaintances like Sarah.
我的熟人中很少有人喜欢萨拉.
2.Only a few of my friends were informed about it.
这件事只有我的几个朋友知道.
3、He had little to tell us.
他没有什么消息告诉我们.
4.We walked a little along the river.
我们沿河走了不远.
There is a little money in my pocket.我的口袋里有一些零钱