两者意思是相同，可以互相替换。
too... to...(太......以至于不......)是个简单句，to后应用动词原形，如：He is too young to dress himself. (他年纪太小自己不会穿衣服。）not enough to ／for（不够做⋯⋯）也是个简单句，to 后应该用动词原形，for后应用名词形式，如：He is not old enough to go to school. （他年龄不够上学。）The coat is not big enough for my brother. ( 这外套我弟弟穿不够大。）
