过去式变化规则
1.regret (regretted, regretting) 后悔
2. control (controlled, controlling) 控制
3. admit (admitted, admitting) 承认
4. occur (occurred, occurring) 出现
5. prefer (preferred, preferring) 宁愿
6. refer (referred, referring) 提到
7. forget (forgetting ) 忘记
8. permit (permitted, permitting)允许
9. equip (equipped, equipping)
原型  过去式
A   
arise—arose
awake—awoke/awakened
B   
bear—bore
beat—beat
become—became
begin—began
bend—bent 
bite—bit
blow—blew
break—broke
breed—bred
bring—brought
build—built
burn—burnt/ burned
burst—burst
buy—bought
C   
cast—cast
catch—caught
choose—chose
come—came
clean的过去式
cost—cost
creep—crept
cut—cut
D   
deal—dealt
dig—dug
do—did
draw—drew
dream—dreamt/ dreamed
drink—drank
drive—drove
E   
eat—ate
F   
fall—fell
feed—fed
feel—felt
fight—fought
find—found
fly—flew
forbid—forbade
forget—forgot
G   
get—got
give—gave
go—went
grow—grew
H   
have—had
hear—heard
hide—hid
hit—hit
hold—held
hurt—hurt
I   
Input—input
Inset—inset
K   
keep—kept
know—knew
L   
lay—laid
lead—led
learn—learned/ learnt
leave—left
lend—lent
let let
lie—lay
lose—lost
M   
make—made
mean—meant
meet—met
mistake—mistook
misunderstand—misunderstood
O     
oversee—oversaw
oversleep—overslept
P   
pay—paid
prove—proved
put—put
Q   
quit—quit / quitted
R   
read—read
rid—rid
ride—rode
ring—rang
rise—rose
run—ran
S   
say—said
see—saw
seek—sought
sell—sold
send—sent
set—set
shoot—shot
show—showed
sing—sang
sit—sat
sleep—slept
smell—smelled/ smelt
speak—spoke
spell—spelled/ spelt
spend—spent
spread—spread
stand—stood 
steal—stole
swim—swam
swing—swung
T   
take—took
teach—taught
tear—tore 
tell—told 
think—thought
throw—threw
U   
understand—understood
undertake—undertook
W   
wake—woke / waked
wear—wore
weep—wept
win—won
wind—wound
withdraw—withdrew
write—wrote
规则动词的过去式由“动词原形+-ed”构成，具体变化有：
1. 直接在词尾加-ed。如: want—wanted, work—worked, need—needed, clean—cleaned
2. 以不发音的e结尾的在词尾加-d。如：like—liked, live—lived, use—used, move—moved
3. 以一个元音字母加一个辅音字母结尾的重读闭音节动词，先双写结尾的辅音字母，再加-ed。如：stop—stopped, trip—tripped
4. 以辅音字母加y结尾的动词，先把y变成i，再加-ed。如：study—studied, carry—carried, hurry—hurried, marry—married
大体上归纳有以下六条记忆法：
1. 以t结尾的词，过去式与原形相同。如：put—put, let—let, cut—cut, beat—beat
2. 以d结尾的词，把d变成t。如:build—built, lend—lent, send—sent, spend—spent
3. 以n结尾的词，在词后加t。如：mean—meant, burn—burnt, learn—learnt
4. 以ow / aw结尾的词，把ow / aw变成ew。如：blow—blew, draw—drew, know—knew, grow—grew
5. 含有双写字母的词，将双写改为单写，在词尾加t。如：keep—kept, sleep—slept, feel—felt, smell—smelt
6. 含有元音字母o / i的词，将o / i变成a。如：sing—sang, give—gave, sit—sat, drink—drank
常见的不规则动词过去式、过去分词
（一）
（1）AAA型（动词原形、过去式、过去分词同形）
  cost（花费）---- cost ---- cost            shut （关上） ----  shut  ----  shut
  cut（割）----  cut  ---- cut            read （读） ----    read  ----  read  [e]
  hit（打）----    hit  ---- hit            hurt 伤害） ----    hurt  ----  hurt
  let（让）  ----  let ---- let              put（放）   ----    put  ----  put
(2) AAB型（动词原形与过去式同形）
  beat（跳动）----  beat ---- beaten
(3) ABA型（动词原形与过去分词同形）
  become（变成）---- became ----become        come（来）---- came ----come           
  run（跑） ---- ran----  run
(4) ABB型（过去式与过去分词同形）

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