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Ⅰ. 这几个词都是表频度的副词，它们之间的区别可用百分比来区分： (0%)→(20%)→ 70%)→(75%)→(100%) 从不 —→ 有时 —→ 时常 —→ 通常 —→ 总是 即：never(0%)→sometimes(20%)→often/frequently(70%)→usually(75%)→always(100%) Ⅱ always “永远、总是”。与进行时连用时，表“再三地、老是”等意思。有时还表“生气或不耐烦”等盛情色彩。如： ① The sun always rises in the east.太阳总是从东方升起。 ② I always get up at seven o’clock. 我总是在七点钟起身。 ③ The boy is always asking whys.这男孩老是问这问那没个完。 Ⅲ often “时常、常常”强调经常性。如： ① He often comes here to see me. 他时常到这儿来看我。 ② We have often been there. Ⅲ frequently “时常、屡次”常与often 通用。但它强调次数频繁。如： ① Business frequently brings him to Shanghai.他时常因事到上海去。 ② He frequently comes here to see her.他时常到这儿来看她。 Ⅳ usually “经常”其动作频率仅次于always.常常与一般过时，一般现在时连用。 | 
