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在叙述现在、将来的事件或状态的句子中,当与表示时间的词语或提示性时间短语共现时,“曾经”表示过去的曾然,而“已经”表示现在的已然或将来的已然。在叙述过去的事情或状态的句子中,“已经”往往含有“所说的事情或情况在某个特定的时间之前就成为事实,其效应与影响一直作用于那个特定时间之后”的意思;“曾经”主要强调句中所说的事情或情况是以往的一种经历,意在说明经历本身、且这一经历不可恢复。
In a sentence that describes present or future events or states, when used in conjunction with words or prompting time phrases that represent time, “used to ” represents the past and “has ” indicates the present or future Already In a sentence that describes the past or the state, “has ” often contains “something or situation referred to before a particular time has become a fact, the effect and influence has been at that particular time” ; “Once” mainly emphasizes that what is said in the sentence is an experience of the past that is intended to illustrate the experience itself and that the experience can not be restored.