always(总是), usually(通常),frequently（经常） often （经常）sometimes(有时), seldom(不常),rarely（极少），never（从不） once(一次), twice(两次)，等。2.频率副词等级 :all the time 100%；almost , always 90%；generally , usually 80%；often , frequently 60-70%；as often as not 40-50%；sometimes , at times 20-30%；occasionally , from time to time 10%；hardly , seldom , rarely 5%；never 0%。
xuliduruixue
