现在完成时和过去完成时都是完成时,指事物从过去开始,区别是,现在完成时表示动作已经做完,强调行为对现在的影响或者动作开始于过去并持续到现在才结束或者还可能继续下去,基本结构：主语+have/has+动词的过去分词；过去完成时强调的是过去某一动作或状态发生在另一动作前或过去某个时间,或指在过去某个时间段已经发生的事情,它就是过去的过去.
现代完成时和过去完成时的区别i have never seen before i had never seen befo
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