enough后什么·时候加doing,什么时候加to do

题目

enough后什么·时候加doing,什么时候加to do
例如
my sister isn's old enough _______ .
A.to take B.taking

答案

enough后面一般只加不定式,构成固定搭配：...enough + 名词 + （for sb） to do sth 或 ...形容词/副词 + enough (for sb) to do sth.
所以此题答案只能选A,不过此题打字有误,因为take后面缺少宾语.
再如：I have enough money to buy this car.
He is clever enough to work out the math problem.
He ran fast enough to catch up with my bike.
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