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1、1.现在完成时表示过去发生或已经完成的某一动作对现在造成的影响或结果。(汉语中常用“已经”、“过”、“了”等表达）通常与表示包括现在在内的时间副词just，already,before,yet,never,ever等状语连用。例如：①Ihaveneverheardofthatbefore.②Haveyoueverriddenahorse?③Haveyoumilkedthecowyet?Yes,Ihavedonethatalready④.I’vejustlostmymathbook现在完成时的用法
2、现在完成时的构成助动词have(has)+动词的过去分词助动词have/has(not)+V-ed（过去分词）I____________(finish)thecompositionalready.He___________(learn)Englishforthreeyears.We/You/Theyhave+P.P….He/Shehas+P.P….havefinishedhaslearned过去分词的构成一、规则变化1、一般情况，直接加–ed2、以e结尾，把–d加，3、辅加y，y变i，-ed加4
3、、重读闭音，双写-ed加写出下列动词的过去分词1.look________2.watch________3.change________4.move________5.study_________6.carry__________7.plan_________8.stop________9.bring_________10.buy_______11.teach_________12.think_________13.become________14.write_______这种用法常与alrea
4、dy,yet,ever,never,just,before(句末)等连用.I________(do)myhomeworkalready.He_____________(notfinished)hishomeworkyet.____youever_____(be)toBeijing?We______never______(see)suchanexcitingmatchbefore.Mother_____just_______(clean)thehouse.Pleasedon’tcomein.The
5、y___________(practice)thisdialoguebefore.havedonehasnotfinishedHavebeenhaveseenhascleanedhavepracticed标志词：for+时间段,since+时间点,overtheyears,sofar,inthepast/last…We__________(learn)Englishforthreeyears/sincetwoyearsago.Mr.Green_________(be)inChinaoverthe
6、years.They____________(write)15songssofar.Thepopulation__________(grow)moreslowlyinthepasttenyears.havelearnedhasbeenhavewrittenhasgrownhave/hasgoneto…have/hasbeenin…have/hasbeento…1.A:Where’sJim,LiLei?B:He____________hisschoollibrary.2.TheGreens____
7、________Chinaforthreeyears.We___________theGreatWalltwice.It’sverybeautiful.hasgonetohavebeeninhavebeentoBAABBstayAhavebeen(to)和havegone(to)的区别：★have/hasbeen(to)表示“曾经到过某地”，说话时此人不在那里，已经回来。侧重指经历。★have/hasgone(to)表示某人“已经去了某地”，说话时此人可能在路上或已到那里，反正不在这里。试比较：
8、HehasbeentoBeijing.他曾去过北京。（人已回来，可能在这儿）HehasgonetoBeijing.他已经去北京了。（人已走，不在这儿）。现在完成时与一般过去时有何区别呢？请看：现在完成时表示过去已经开始，持续到现在,也许还会持续下去的动作或状态。可以和表示延续的时间状语连用。如for、since等引导的时间状语。（注意：句中谓语动词要用延续性动词）一段时间的表达方法有两种:for:+一段时间forayearfortwoweeksforthreeyears过去的某一时刻,since
