频率副词有哪些?答: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.all the time 100%;almost ,always 90%;generally ,usually 80%;often ,frequently 60-70%;as often as not 40-50%;sometimes ,at ...