求常用介词副词答:副词 [adverb] 起修饰或限制动词或形容词作用、表程度或范围的词。1) 时间和频度副词:now,then,often,always,usually,early,today,late, next,lastday,already,generally,frequently,seldom,ever,never,yet,soon,too,immediately, finally,shortly, before, ago,sometimes, yesterday. once,twice 2) ...