enough的用法
1. 用作名词，表示“足够(的数目或数量)，没有复数形式，但根据情况可表示复数意义。如：
Enough has been said about this subject. 关于这个问题已说得够多了。
Enough were present to constitute a quorum. 出席的人数够法定人数。
2. 用作形容词，通常修饰复数名词或不可数名词，可放在被修饰名词之前或之后(但以前置为多见)。如：
He has enough money to buy a car. 他有足够的钱买辆汽车。
We have time enough to get to the airport. 我们来得及赶到机场。
【注】有时与某些具有形容词意味的名词连用，此时 enough 必须后置，且该名词通常不用冠词。如：
I was fool [=foolish] enough to accept his offer. 我接受他的提议真是太傻了。
3. 用作副词，可用来修饰形容词、副词、动词等，此时总是放在被修饰语之后。如：
He didn’t practise enough. 他练习得不够(from www.yywords.com)。
She isn’t good enough for [=to pass] the exam. 她的功课还不够好，还考不及格。
I don’t know him well enough to ask him for help. 我和他不够熟，不能请他帮忙。
其后可接不定式或介词 for, 但一般不接that-从句。如：
在这条河里游泳水够深吗?
正：Is the river deep enough to swim in?
正：Is the river deep enough for swimming in?
误：Is the river deep enough that people can swim in?
在口语中，出于客气和礼貌，人们常用类似于下面这样的句型:
Would you be kind enough to open the window? (=Would you
be so kind as to open the window?) 请你打开窗户好吗?
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