一、enough可以作名词、代词,意思是"足够;充分"。作代词可以代替可数名词或不可数名词,在句中作主语或宾语。
例句:
Enough has been said on this subject.
关于这一问题说得已经足够多的了。
注意:当enough后的名词前有冠词、形容词性物主代词、指示代词或其本身就是代词时,要用介词of。
例句:
We've had enough of your coldness.
我们已经受够了你的冷漠。
二、enough作形容词,意思是"足够的;充分的",常与for或不定式连用,可以作定语或表语。作定语置于被修饰的名词前后均可,前置时强调enough,后置时强调被修饰词。
例句:
Five men will be quite enough.
五个人就足够了。
三、enough作副词的意思是 "十分地;充分地;足够地;充足地",置于被修饰的形容词或副词之后,常与不定式或介词for连用 ,在句子中作状语,表示程度。
例句:
When they reached the burning building they found that their ladders were not long enough to reach the people who were trapped.
当他们靠近烈火熊熊的大楼时,他们发现梯子不够长,够不着那些被火围困的人。
四、enough作感叹词时意思是"够了;停止;住手;不要再继续了",用以表达不耐烦或恼怒。
例句:
You've been practising the violin all afternoon. Enough!
你整个下午都在练小提琴。够了!
五、用在"主语+cannot...+enough"句型中该句型形式上是否定句型,实际上表达的是肯定意义,意思是"再……也不过分;越……越……"。
例句:
I cannot thank you enough.
我对你感激不尽。(我怎么感谢你都不算过分。)
六、enough还可以用于以下的短语中
1、sure enough 果真;确实。
例句:
He said he would come, and sure enough he came.
他说要来,果然来了。
2、well enough 还不错; 还可以; 相当; 很; 极。
例句:
You know well enough.
(口)你明明知道。(你心里明白。)
3、be good / kind enough to do sth. 劳驾; 务请做某事。
例句:
Be good / kind enough to reply early.
请早日康复。