1)原形、过去式、过去分词相同。(AAA)
cost(花费)----cost----cost
cut(切)----cut----cut
hurt(刺痛)----hurt----hurt
hit(打)----hit----hit
put(放)----put----put
let(让)----let----let
set(安置)----set----set
read(读)----read----read
2)过去式、过去分词相同。(ABB)
bring(带来)----brought----brought
build(建造)----built----built
buy(买)----bought----bought
catch(抓住)----caught----caught
dig(挖)----dug----dug
feed(喂)----fed----fed
feel(感到)----felt----felt
find(找到)----found----found
get(得到)----got----got
have(有)----had----had
hear(听)----heard---heard
hold(举行)----held----held
keep(保持)----kept----kept
lay(搁) ----laid----laid
leave(离开) ----left----left
lose(丢失) ----lost----lost
make(制造) ----made----made
mean(意思) ----meant----meant
meet(遇见) ----met----met
pay(付) ----paid----paid
say(说) ----said----said
sell(卖) ----sold----sold
send(送)sent----sent
sit(坐) ----sat----sat
sleep(睡) ----slept----slept
smell(嗅) ----smelt----smelt
spell(拼写) ----spelt----spelt
spend(度过) ----spent----spent
stand(站) ----stood----stood
teach(教) ----taught----taught
tell(告诉) ----told----told
win(赢) ----won----won
think(想) ----thought----thought
understand(理解) ----understood----understood
buy_bought_bought买