现在完成时 ThePresentPerfectTense一 构成: have/has+动词过去分词 (pp) 肯定主语+have/has+pp 否定主语+have/hasnot+pp 疑问Have/Has+主语+pp+其他 Yes,主+have/has.No,主+havent/hasnt.Ihavefinishedmyhomework. Ihavenotfinishedmyhomework. Haveyoufinishedyourhomework? Yes,Ihave./No,Ihavent. ShehasbeentoEurope. ShehasntbeentoEurope. HasshebeentoEurope? Yes,shehas./No,shehasnt.1.规则动词：与过去时变化相同。 (1)一般+-ed work-worked-worked (2)以“e”结尾,+-d。 live-lived-lived (3)“辅音字母+y”结尾，y变i,+-ed。 cry-cried-cried (4)重读闭音节结尾(辅元辅)，双写后+-ed。 drop-dropped-dropped
