现在完成时ThePresentPerfectTenseWatchandThinkLookatTheseSentences基本结构和概念否定句：主语+have/has+not+done（过去分词）+其他一般疑问句：Have/Has+主语+done（过去分词）+其他简单答语：Yes,主语+have/has.（肯定）No,主语+haven’t/hasn’t（否定）过去分词二、不规则动词AAA型hurthurthurtcutcutcutAAB型becomebecamebecomecomecamecomeABB型bringbroughtbroughtbuyboughtboughtstandstoodstoodABC型breakbrokebrokengrowgrewgrown三、瞬间动词瞬间动词(buy,die,come,go,leave)与for,since连用，要改变动词buy---keep,havecome---beinleave---beawaybegin---beonfinish---beoverdie---bedeadreturn---bebackjoin---beinopen---beopenclose---beclosed功能一：表示影响Shehaswashedherclothes.Shehasdoneherhomework.Shehaswateredtheflowers.Shehassweptthefloors.TheyhavewatchedTV.功能二：表示持续功能三：表示重复注意：PracticeChoosetheRightOneThankyou!