现在完成时及动词变化

现在完成时定义1. 表示过去不确定的时间发生的动作，对现在有影响。2. 表示过去发生并持续到现在的动作。 规则动词：规则动词的过去分词的构成规则与规则动词的过去式的构成规则相同。四点变化规则： (1）、一般动词，在词尾直接加“ ed ”。 work-worked-worked,visit-visited-visited (2）、以“ e ”结尾的动词，只在词尾加“ d ”。 live-lived-lived, (3）、以“辅音字母 + y ”结尾的动词，将 y 变为 i ，再加“ ed ”。 study-studied-studied,cry-cried-cried (4）、重读闭音节结尾，末尾只有一个辅音字母，先双写该辅音字母，再加“ ed ”。 stop-stopped-stopped,drop-dropped-dropped 不规则动词：ABC型原型 过去式 过去分词 原型过去式过去分词begin began begun give gavegivenbearboreborn,bornegowentgoneblow blew blownknow knew knownbreak broke broken grow grew grownchoose chosechosenlie lay laindraw drew drawnride rode riddendrive drove driven rise rose risendo / doesdiddonering rang rungfly flew flown shake shook shakenforgive forgave forgivensing sang sungforget forgot forgotten,forgotbe was/were beenfreeze froze frozensink sank sunkwrite wrote writtenswim swam swumtake took taken throw threw thrownwear wore worndrink drank drunk see saw seenAB型 原型 过去式 过去分词 原型 过去式 过去分词 can could willwouldmaymightbewas/wereshallshouldAAA型 原型 过去式 过去分词 原型 过去式 过去分词 burstburstburstputputputcastcastcastsetsetsetcutcutcutshutshutshuthithithitspreadspreadspreadhurthurthurtletletletcostcostcostreadreadreadAAB型 ABA型 原型 过去式 过去分词 原型 过去式 过去分词 beat beat beaten,beat become became become runranruncomecamecome特殊情况 read read read (read原形发音为/ri:d/，过去式和过去分词发音为/red/) ABB型 原型 过去式 过去分词 原型 过去式 过去分词 bring brought brought sellsoldsoldbuyboughtboughtshootshotshotbuildbuilt built saysaidsaidburn burnt burnt sitsatsatcatchcaught caught standstoodstooddigdugdugshineshoneshonefeelfeltfeltsweep swept swept fightfoughtfoughtsleepslept slept find foundfoundteach taught taught feed fedfedtell told told get got got think thought thought hanghung,hangedhung,hangedwin won won hearheardheardwind wound wound holdheldheldmake made made keep kept kept meanmeant meantlay laid laid meetmetmetlead led led paypaidpaidlose lost lost lend lent lent leave left left