频率副词：一般用来表示动作发生的频率。一般放在be动词之后或者助动词与主要动词之间 但sometimes、often等还可以放在句首或句尾,usually可放在句首,once可放在句尾,twice、three times等一般放在句尾。如：Sometimes I get up early.(我有时起得早)/ The workers usually have lunch at the factory.(工人们通常在厂里吃午饭) / Take this medicine twice a day.(这种药一天吃两次)1.频率副词是表示与次数,频率有关的副词,如: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%。3.频率副词用在be动词后。He always gets up at 6:30.他经常六点半起床。4.频率副词用在主要动词前。My father usually walks home.我的父亲经常步行回家。5.频率副词用在助动词与实义动词之间。I will always love you.我将永远爱你。6.频率副词用在ought to之间。You ought often to write to your mother.你应该常给你母亲写信。7.在答句中,频率副词必须放在助动词前。Do you often go there?你常去那里吗?(误)Yes, I do often.是的,我常去。(正)Yes, I often do.是的,我常去。8.never(从不), seldom(很少,不常)用于句首时,句子要用倒装形式以加强语气。Never have I been there.我从未去过那里。Seldom do I watch TV.我很少看电视。频率副词位置记忆口诀：be后实动前助主间对频率提问用how often或how many times
樑樑1982
