副词是针对单个单词 , 跟语境无关系
副词可以做状语 , 句子所做的成分 ;
状语 : 由引导词 引出后面的一个主谓宾的句子
He succeeded both because he was intelligent and because he worked hard;
both and 连接的状语从句
He succeeded both because of his intelligence and because of his hardwork;
both and 连接的副词短语
形容词做状语,表示他可以和主语构成系表结构.
eg:Happy,he goes to sleep.
He is happy.这种系表结构. 修饰一部分
副词作状语是修饰整个句子的.
eg:Happily,he goes to sleep.
这种就是修饰整个句子的.
Yesterday I met Tom, a friend of my brother's.
昨天我遇到了我弟弟的朋友汤姆。
a friend of my brother's是受词Tom的同位语,指同一人。