小学英语语法专题：时态的分类（现在完成时的构成和不同人称的用法）

什么是现在完成时？现在完成时指的是过去发生并且已经完成的动作对现在造成影响或后果，过去某一时间开始并一直持续到现在并且有可能还会持续的动作或状态。一. 基本构成：have / has+done（动词的过去分词p.p）I have finished my homework.我已完成了作业。（这里的finished就是动词finish的过去分词。）二.动词过去分词变化规则我们和动词过去式一起来记忆吧！变化规则动词原形动词过去式动词过去分词A-A-A型cutcutcutputputputreadreadreadsetsetsethurthurthurtletletletshutshutshutA-B-B型bringbroughtbroughtbuyboughtboughtkeepkeptkeptA-B-B型buildbuiltbuiltsendsentsentspendspentspenttelltoldtoldthinkthoughtthoughtteachtaughttaughtA-B-B型saysaidsaidmeetmetmetmakemademadeA-B-C型beginbeganbegundrinkdrankdrunksingsangsungringrangrungblowblewblownflyflewflowndrawdrewdrawngrowgrewgrowndrivedrovedrivenrideroderiddenbreakbrokebreakenfreezefrozefrozenforgetforgotforgetteneatateeatenfallfellfallentaketooktakengowentgoneA-A-B型beatbeatbeatenA-B-A型comecamecomebecomebecamebecomerunranrun学习小贴士情态动词没有过去分词。Be动词（am，is，are）的过去分词只有been.三. 现在完成时不同人称的用法Ihavewashed my car.我洗过车子了。Wehavedone the whole work.我们干完了所有活儿。Theyhavegone.他们已经走了。Haveyou seen the doctor？你看过医生了吗？Hehasbeen to Hong Kong.他去过香港了。The boyhaswalked for a long time.这个男孩已经走了很长时间了。学习小贴士现在完成时中，主语是I/you/we/they时，助动词用have；主语是第三人称单数时，助动词用has。