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enough是十二单元的四会词，也是中考测试的热点词，现对它的用法进行归纳总结，以便于同学们学习。 1.用作名词，意为“足够，充分”。如：
He could not earn enough to keep a family of four. 他所挣的钱不足以养活四口之家。
Not enough is known about the sea.
对海洋的了解不够。
Enough is enough.适可而止。
2.用作形容词，意为“足够的，充分的”，修饰名词时可以放在名词前，也可用在被修饰的名词后。常见句式为“enough for sb./sth.”或“enough (for sb.) to do sth.”。如：
Have you made enough copies?
你复制的份数够吗？
There is food enough to last three days.
有足够的食物维持三天。
Is there enough food for everyone?
有足够大家吃的食物吗？
They have money enough to buy a car.
他们有足够的钱买一辆小轿车。
Surely 15 minutes is enough time for you to have a coffee. 你喝咖啡15分钟当然够了。
3.用作副词，意为“足够地，充分地”，放在修饰的形容词、副词或动词之后。常见句式为“adj.+enough+(for sb.) to do sth.”。如：
I don’t know him well enough.
我还不够了解他。
You have talked enough. 你说的够多了。
Is he old enough to go to school?
他到了上学的年龄了吗？
The text is not easy enough for you to read. 这篇课文对你们来说不容易读。
●使用enough时应注意：
1.enough不能与no连用，但可以与not连用。试译：
我没有足够的时间到达飞机场。
误：I have no enough time to get to the airport.
正：I have not enough time to get to the airport.
2.enough用作形容词时，不能被very修饰，但可以与quite连用。试译：
桌上有足够吃的食物。
误：There is very enough food on the table. 正：There is quite enough food on the table.
3.有的形容词不能被enough修饰。如glad, pleased等，可被它修饰的形容词有old, poor, rich, clever, strong, high, tall, well, wide, wise等。试译：
看见你他很高兴。
误：He is glad enough to see you.
正：He is very glad to see you.
4.enough用作形容词或副词时，没有比较等级。试译：
你们午餐的三明治够吃吗？
误：Have you got more enough sandwiches for lunch?
正：Have you got enough sandwiches for lunch?
5.“…not+adj.+enough (for sb.) to do…”可与“too…(for sb.) to…(太……而不能……)”相互转换，只是这两个句型中的形容词要互为反义词，前一句型要用于否定句。它也可与so…that句型相互转换。如：
He is too young to go to school.
→He is not old enough to go to school.
→He is so young that he can’t go to school.
他太小不能去上学。
The box is too heavy for him to carry.
→The box is not light enough for him to carry.
→The box is so heavy that he can’t carry it.
箱子太重他搬不动。