是enough to do sth.,不是enough doing sth.
enough可作名词、形容词和副词用。作形容词用修饰名词时，可放在被修饰词之前，也可放在被修饰词之后。当作副词用时，修饰形容词或副词，只能放在被修饰词之后。如：
Peter has enough money to buy a new car.
Peter has money enough to buy a new car.
Peter is strong enough to lift this big box.
Peter runs fast enough to catch the thief.
