usually,never，often,sometimes,always和hardly ever是英语中最常见的频度副词,他们在句中的位置大致相同：通常放在行为动词之前,系动词be、助动词和情态动词之后.但是他们所表示的含义及频度各不相同.(1) always 的频度为100%,表示动作重复、状态继续,中间没有间断,意思是“总是”、“永远地”.例如：The sun always rises in the east and sets in west.太阳总是东升西落.(2) usually 的频度为70%左右,意为“通常”、“平常”,即很少有例外.例如：He usually goes to bed at ten o’clock.他通常10点钟睡觉.(3) often 的频度为50%左右,意为“常常”,但不如usually那么频繁,表示动作重复,中间有间断.例如：He is often later for school.他上学经常迟到.very often 语气比often 重,常位于句首或句末.例如：He doesn’t go to London very often.他不常去伦敦.(4) sometimes 的频度为20%左右,意为“有时”,表示动作偶尔发生.可以位于句首,以示强调.例如：It is sometimes hot and sometimes cold.天气忽冷忽热.Sometimes he does it this way and sometimes he does it that way.他有时这样做,有时那样做.(5) hardly ever 的频度为5%左右,意为“几乎不”、“偶尔”.例如：I hardly ever go out these days.这些天我几乎不出门.(6) never 的频度为0,意为“从来不”、“永不”.例如：My parents are never late for work.我父母上班从来不迟到.
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