well的用法：
1、用作副词(adv.)。
i can't sleep well because the tap is dripping.
龙头漏水,吵得我睡不好觉。
2、用作感叹词(int.)。
well, who would have thought it?
哎, 谁想得到是这样啊?
3、用作形容词(adj.)。
we're very well where we are.
我们处境很好。
4、用作名词(n.)。
she has the well of enthusiasm.
她是热情的源泉。