例句: I often visit my teachers. 我经常看望我的老师。 例句: They do morning exercises every day. 他们每天做早操。 ①其中根据频度的“密疏”，频度副词的排列顺序是：always, usually, often, sometimes ,
seldom, hardly, never always 总是，一直 100% usually 通常 80%左右 often 经常 50% sometimes 有时 20% seldom 很少 5% never 从不，绝不 0%
②频度副词通常放在行为动词之前，be动词、助动词和情态动词之后；而副词短语经常位于句末或句首。例如： I often get up early. 我经常起得早。 He is always kind to others. 他总是对别人很好。 I walk to school every day. 我每天步行去上学。 ③对频度副词提问时，用how often. --How often do you go to see your grandparents? --Once a week.
区分：sometime, some time, sometimes, some times，every day，everyday
sometime 指将来或过去的“某个时候”，指时间点 some time “一些时间，相当长的时间”，指时间段 sometimes 有时，是频度副词
some times 几次，几倍，time作可数名词，意为“次数，倍数” every day 表示“每天，天天”，是副词短语；
everyday 表示“日常的”，是形容词，强调平常与普通。