规则动词的过去式和过去分词变化规律
1.在动词末尾直接加ed ，如 work-worked, plant-planted,call-called
2.以字母e结尾的动词直接加d，如live-lived, change-changed,like-liked,love-loved,还有其它动词，agree,save hate, move,arrive, skate,hope, use等。
3.以重读闭音节结尾，末尾只有一个辅音字母的， 双写末尾的辅音字母，再加ed. 如：plan-planned, stop-stopped,还有drop,fit(适合), prefer(更喜欢), travel等。
４.以辅音字母＋y结尾的动词，变y为i，再加ed，如try-tried,study-studied,还有carry, hurry, cry, worry,copy等。
过去式和过去分词的不规则列表
1．原形同过去式和过去分词相同的不规则动词
cost-cost-cost      cut-cut-cut    hit-hit-hit    hurt-hurt-hurt
let-let-let        put-put-put    read-read-read
2．原式同过去分词或过去式相同的不规则动词
become-became-become          come-came-come
run-ran-run                    beat-beat-beaten
3．过去分词同过去式相同的不规则动词
bring-brought-brought          buy-bought-bought          fight-fought-fought            think-thought-thought        catch-caught-caught            teach-taught-taught 
build-built-built                lend-lent-lent                send-sent-sent                 feel-felt-felt
spend-spent-spent              lose-lost-lost               
keep-kept-kept                sleep-slept-slept              sweep-swept-swept            sell-sold-sold
leave-left-left          burn-burnt-burnt（burn-burned-burned）mean-meant-meant     l
earn-learnt-learnt（learn-learned-learned）        meet-met-met         smell-smelt-smelt（study的过去分词smell-smelled-smelled）
tell-told-told          shine-shone-shone（shine-shined-shined）
win-won-won              hold-held-held                get-got-got                have(has)-had-had
stand-stood-stood          understand-understood-understood
dig-dug-dug            hang-hung-hung        sit-sat-sat                               
hear-heard-heard      make-made-made        say-said-said        pay-paid-paid         find-found-found         
4．原形、过去式和过去分词三者都不相同的不规则动词
be(am,is)-was-been              be(are)-were-been
do-did-done        go-went-gone          wear-wore-worn
lie-lay-lain（lie-lied-lied撒谎）    see-saw-seen              begin-began-begun               sing-sang-sung
drink-drank-drunk              ring-rang-rung           
swim-swam-swum              drive-drove-driven          rise-rose-risen                blow-blew-blown
ride-rode-ridden              write-wrote-written         
grow-grew-grown              know-knew-known          throw-threw-thrown          show-showed-shown
fly-flew-flown                draw-drew-drawn           
break-broke-broken          speak-spoke-spoken          choose-chose-chosen          eat-ate-eaten
take-took-taken            mistake-mistook-mistaken      fall-fell-fallen           wake-woke-
woken（wake-waked-waked） 
give-gave-given              forget-forgot-forgotten