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1、现在完成时ThePresentPerfectTense现在完成时的基本结构have/has+动词过去分词（has用于第三人称单数）过去分词的变化：(1)规则变化构成规则原形过去式过去分词一般在动词原形末尾加-edworkplayworkedplayedworkedplayed结尾是e的动词加-dhopelivehopedlivedhopedlived末尾只有一个辅音字母的重读闭音节词，先双写这个辅音字母，再加-edstoptripstoppedtrippedstoppedtripped结尾是“辅音字母+y”的
2、动词，先变“y”为“i”再加-edstudyworrystudiedworriedstudiedworried不规则动词的过去式以及过去分词 巧记规律AAA:put–put–putlet—let–letABA:become—became—becomeABB:stand—stood—stoodABC:eat—ate—eatenAAAcost-cost-costread-read-readput-put-putcut-cut-cutlet-let-letset-set-sethit-hit-hithurt-hur
3、t-hurt原形、过去式和过去分词的词形和读音都相同的单词，结尾字母一般是t或d。特殊：动词read的过去式和过去分词虽然词形与原形一致，read-read-read，但发音分别是[ri:d]-[red]-[red]。有些动词的过去分词与原形是一样的:run-ran-runcome-came-comebecome-became-becomeovercome-overcame-overcomeABA原型过去式过去分词例词-eep-ept-eptkeep,sweep,sleep-ell-old-oldsell,t
4、ell-d-t-tlend,spend,send,build-ay-aid-aidsay,pay,lay-n-nt-ntburn,learn,mean-ee--e--e-meet,feed-ought-oughtbring,buy,fight,think-aught-aughtcatch,teachABB(含规则动词)1.另有一些其它形式的变化。have(has)-had-hadleave-left-leftlose-lost-lostmake-made-madefeel-felt-feltspell-spe
5、lt-speltstand-stood-stood2.改变单词中间元音字母。sit-sat-sat(babysit)win-won-wonshine-shone-shonehold-held-heldfind-found-foundhear-heard-heardhang-hung(hanged)-hung(hanged)ABB(含规则动词)ABC原型过去式过去分词例词-eak-oke-okenbreak,speak-eal-ole-olensteal-ear-ore-ornwear,bear,tear-ow
6、（aw）-ew-owngrow,blow,know,throw,draw-i--a--u-sink,swim,drink,ring,sing,begin-i--o--ndrive,rise,ride,writeABC有些动词的过去分词是在原形词尾加n或en，变成以en结尾的单词。take-took-takengive-gave-givenfall-fell-falleneat-ate-eaten write-wrote-writtenspeak-spoke-spokenfreeze-froze-frozenr
7、ide-rode-riddenget-got-gotten(got)forget-forgot-forgotten(forgot)特殊：am/is-was-beenare-were-been,do(does)-did-donego-went-gonesee-saw-seenshow-showed-shown(showed)lie-lay(lied)-lain(lied)写出下列动词的过去分词形式.wake______2.teach______3.sell________4.see________5.ride_
8、______6.pay_____7.choose______8.throw_____9.think_______10.eat_____11.drive______12.catch______13.bring______14.break______15.give_______16.get_________17.know_______18.open_______19.write_______20.for
