Sometime是个时间副词,意思是“在某时期”.这个字通常 和“日期”或“时间”连用,出现在句子后半部,用来固定本来不肯定的时间或日期.例如：
① The accident happened sometime last month
② Let us discuss the matter sometime next week.
Sometimes是个频率副词,意思和 “occasionally”,或“from time to time”甚接近,就是“有时候”或“偶尔”之意.“Sometimes”和“sometime”不但意思不同,所处的位置也不一样.
“Sometimes”可以在下列三处出现：
⒈句首,如：Sometimes,I didn't feel like working.
⒉接系动词“be”之后,如：The new manager was sometimes very hot-tempered.
⒊动词前,如：They sometimes stayed up until 2 o'clock.
从这三个例子看,“sometime”和“sometimes”不但意思不同 ,所处的位置也大相径庭.
就用途来说,“sometime”的用途广些.除了表示“在某时期 ”这意思之外,它也含有“任何时候”的意义,如：* Come over and see me sometime.这里的“sometime”,可以用“anytime”代替,即：Come over and see me anytime.
此外,“sometime”可以当形容词用,意思是“以前的”,如：
* Dr Chen,a sometime lecturer of chemistry,is now a big company director.
这里的“sometime”不妨以另外一个形容词“former”或前缀“ ex-”来取代：
*Dr Chen,a former lecturer of chemistry,is now a big company director.
* Dr Chen,an ex-lecturer of chemistry,is now a big company director.
**另外,“sometime”和“some time"的意思不同.“Sometime”是“在某时期”；“some time” 是“一段时间”,如：
*All of us have studied English for some time.
* Betty has been grumbling for some time.
* Please give me some time to think over your proposal.
由于 sometimes,sometime和 some time 各有不同的意思,在同句里出现可以和平共处、相安无事：
* Sometimes,I spent some time reading a sometime English lecturer's novel written sometime in 1996.