usually often occasionally sometimes的频率区别是怎样的

欲掌握这些副词区别,最好的方法是免用中文翻译定义."Think English,understand in English."才会进步.
(A)usually 通常(副词adv)= (sentence modifier)定义 customarily; at most times; in the ordinary course of events;[同义词:most often;commonly,normally,ordinarily,unremarkably]
例句=The best information about hotels usually comes from friends.
(B)often 经常(副词adv)= 定义 Many times; frequently;in many cases.[同义词:frequently,oft,oftentimes,ofttimes]
例句=I often go to the theatre; I should see him more often.
(C) occasionally 偶尔(副词adv)= 定义 Now and then; from time to time.[同义词:at times,from time to time,now and again,now and then,on occasion,once in a while]
例句 = I occasionally go to the cinema with a friend.
(D) sometimes 有时候(副词adv)(同义词:occasionally)=定义 At times; now and then.
例句="Sometimes she wished she were back in Beijing"
(E) sometime 某时(副词adv) =定义(i)At an indefinite or unstated time.[同义词:some day,one day.]
例句= I'll meet you sometime this afternoon.
定义(ii)At an indefinite time in the future:
例句=Let's get together sometime.