careful enough 和 carefully enough

题目

careful enough 和 carefully enough
He is careful enough to look after little Betty
She can look after your pet carefully enough
为什么第一句用careful enough 而第二句用carefully enough

答案

因为第一个是前面是Be动词is,后面加形容词,
第二个前面是动词look after,所以用副词来修饰.