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（很少），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 is always late for class.
他经常迟到。
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。
9.sometimes(有时）和usually（通常）可以放在句前和句末。
Sometimes I go to school by bus.
我有时坐公交车上学。
I go to school by bike usually.
我通常骑车上学。
