The Present Perfect tensepresent(now) future past Present Perfect Tense 现在完成时主语 + have/ has + 过去分词（pp ） 助动词,无意义 现在完成时的结构 Winter has already come ， will it still be far in spring ?主语 + have/ has + 过去分词（pp ） 否定形式 havent ( have not ） + 过去分词 hasnt ( has not ) + 过去分词 疑问句 把助动词 have / has 放在句首 现在完成时的结构 注：主语若是第三人称单数助动词用hasYou have planted all the trees. I have planted all the trees. He/she has planted all the trees. They have planted all the trees. 区别have 和 has 的用法 主语若是第三人称单数助动词用has1) 表示到现在为止已经完成或刚刚完成的动
