什么是副词?

定 义:
副词是一种用来修饰动词,形容词,副词或全句的词,说明时间,地点,程度,方式等概念。
分 类:
1) 时间和频度副词:
now,then,often,always,usually,early,today, lately, next,last,already,generally,frequently, seldom,ever,never,yet,soon,too, imm