区别：

a few修饰可数名词，表示几个，是一个肯定陈述，意思是有一些。

如：

I gave a dinner party for a few close friends.

我为几个密友办了晚宴。

We had a few drinks afterwards...

后来我们喝了几杯

some表示一些，可以修饰可数名词和不可数名词，用于肯定句。

Robin opened some champagne.

罗宾开了一些香槟。

Heat a couple of tablespoons of olive oil， a chopped clove of garlic and some black pepper in a heavy saucepan.

将几勺橄榄油、一片切碎的`蒜瓣和一些黑胡椒粉放入深平底锅里加热。

He went to fetch some books.

他去拿一些书来。