good 放在句末为什么要换成well

1、good是形容词修饰名词。例句He is a good student.well是副词修饰动词。He can draw cartoons well.We play football well.The girl sings well.Work quietly.

2、Good luck! He often laughs happily.We are happy girls.

3、在英语学习中要明确它的词性和用法。