so that和too to 还有enough to do 可以替换,是如何替换的,有固定模式吗?请详解,

题目

so that和too to 还有enough to do 可以替换,是如何替换的,有固定模式吗?请详解,
（肯定句和否定句有区别吗）

答案

可以看看这三个例句 他太小而不能开车.
he is too young to drive a car.
he is so young that he can not drive a car.
he is not old enough to drive a car.
就是这样的模式,由too to 句变为so that 或 enough to do 句,要形式变为否定（其实句意都一样）