1.enough做形容词，“表示足够的，足够量的”，通常与for连用。如：
They had enough cash for a one-way ticket.
他们有足够的现金买一张单程票。
Her disappearance and death would give proof enough of Charles' guilt.
她的失踪和死亡将提供足够的证据证明查尔斯有罪。
 
2.enough做副词，表示“足够地， 足够量地，相当地”如：
I was old enough to work and earn money.
我到了可以工作、挣钱的年龄了。
I'm serious, things are difficult enough as they are.
我是认真的，事情照现在这样已经够困难的了。
Winters is a common enough surname.
温特斯是一个相当普通的姓。
 
3.enough做名词，表示“足够的人或事”，如：
Although the police say efforts are being made, they are not doing enough.
尽管警方说他们正在努力，但是他们做得还不够。
 
4.enough做代词，表示“够了”，既可代表可数名词，也可代表不可数名词。如：
I met him only the once, and that was enough.
我只见过他一次，那就够了。
----Do you need more chairs?
你们还要椅子吗?
----No. I think there are enough to go round.
不要了，我想够用了。
 
5.Strangely enough真奇怪
interestingly enough真有趣
Strangely enough, the last thing he thought of was his beloved Tanya.
真奇怪，他最后想到的是他心爱的坦尼娅。
 
6.have had enough 受够了
I had had enough of other people for one night.
一个晚上我就受够其他人了。