Present Perfect Present Perfect TenseTensepresent(now)futurepast Present Perfect Tense 现在完成时主语 + have/ has + 过去分词（pp） 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、规则变化（过去分词与过去时变化规则一样）(1)、一般动
