本文运用比较法和考察语义背景法探讨了“已经”和“曾经”的语法意义,得出的结论是:1、“已经”强调句子所说的事情、情况在说话之前,或在某个行为动作之前,或在某个特定的时间之前就成为事实了,其影响与效应具有延续性和有效性。2、“曾经”强调句中所说的事情或情况是以往的一种经历,其影响与效应具有非延续性和非有效性。 This paper explores the grammatical meanings of “already ” and “once ” using the comparative method and the investigation of the semantic background method, and concludes that: 1) “already ” emphasizes what the sentence says, , Or before a certain action or before a certain time has become a fact, the impact and effect of a continuity and effectiveness. 2. “Once” emphasizes that the things or situations mentioned in the sentence are an experience of the past, and their influences and effects are non-continuous and ineffective.