请问英语语法中的定语和状语有什么区别?希望大家能举例帮我分析一下,

定语是来修饰名词或代词的,状语是来修饰动词,形容词,副词和整个句子的.如
he is a tall boy. 这句中tall作定语修饰后面的名词
he go to school on foot这句中. on foot作状语修饰谓语动词
there is a book in the bag. in the bag作地点状语
the boy standing at the door is my brother. standing at the door作定语修饰前面的名词
I have something important to tell you. important作定语修饰前面的代词.