不规则动词的过去式 非实意动词的过去式：
am, is — was
are — were have, has — had
can — could may — might
助动词的过去式：
do, does — did
将来时助动词：
shall — should
will — would
动词原形与过去式一致：
let — let
set（设置，设定）
— set put — put
read — read cut — cut
i 变
a ：
sit（坐）
— sat
sing — sang swim — swam
begin — began drink — drank
give — gave ring（打电话，按铃）— rang
i 变
o ：
drive — drove
ride — rode shine（照耀）
— shone
win — won write — wrote
rise（升起）— rose
ow 变
ew ：
blow（吹）— blew
grow（成长）— grew know — knew
throw — threw
字尾由 d 变
t: lend（借出）
— lent
build — built send（邮寄）— sent
bend （弯曲）— bent spend（花费，度过）— spent
字尾由 ep 变
pt ：
keep — kept
sleep — slept sweep — swept
其他：
come— came
become — became buy — bought
bring（带来）— brought teach — taught
catch — caught
tell — told
sell（出售，卖）— sold feel — felt
smell — smelt stand — stood
take — took get — got
forget（忘记）
— forgot go — went
draw — drew eat — ate
hear — heard leave（离开）— left
make — made meet — met
run — ran see — saw
fly — flew speak — spoke
think — thought
say — said
wear（穿着）
— wore find — found
feed — fed