enough,adequate
意思都含“充分的”、“足够的”. 但是区别较大：
enough 系常用词, 常可与 sufficient 互换, 它除表示“足以满足需要的”外, 还含有“数量很多使人感到心满意足的”的意思, 如:
We have enough money to spend.
我们有足够的钱花.
If you have _______ time, you can take a rest.
A. adequate B. lot C. much D. enough
答案肯定选D
adequate 指“足够符合特定(有时可指最低)的资格、分量、才能等”着重“符合一个客观要求或标准的”, 如:
To be healthy one must have an adequate diet.
一个人想要健康, 必须有足够的规定饮食.
注意:enough 还可以做副词,来修饰形容词,但必须放在形容词的后面
例: She is not old enough to go to school
她没有达到上学的年龄.