not often&often&usually&sometimes 之间的频率区别?特别是not often!

not often&often&usually&sometimes 之间的频率区别?特别是not often! more often than not 和usually ,often,always的区别 usually often occasionally sometimes的频率区别是怎样的 often 的usually区别 频度副词always/usually/often/sometimes/never的用法区别 频度副词always.usually.often.sometimes.never的用法区别 always,usually,often,sometimes用法的区别?急!@ often/usually频率高? sometimes,almost always,not very often,often,always,very oft not very often等于seldom还是sometimes usually often sometimes 的用法是什么 频率副词的频率排列如果给你always、usually、often、sometimes、never呢