The Present Perfect tensepresent(now)futurepast Present Perfect Tense 现在完成时现在完成时主语主语+have/has+过去分词过去分词（pp）助动词助动词,无意义无意义 现在完成时的结构现在完成时的结构Winter has already come，will it still be far in spring?主语主语+have/has+过去分词过去分词（pp）否定形式否定形式 havent(have not）+过去分词过去分词 hasnt(has not)+过去分词过去分词疑问句疑问句 把助动词把助动词 have/has 放在句首放在句首 现在完成时的结构现在完成时的结构注：主语若是第三人称单数助动词用注：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.区别区别have 和和 has
