不规则动词
动词过去式与原形相同；
动词过去式以-ought或-aught结尾；
动词过去式由原形结尾的-end变为-ent；
动词过去式以-elt，-eft，-ept结尾；
动词过去式与原形比较，其中一个元音字母发生改变；
动词过去式以-ew结尾；
动词过去式-ee-变为-e-。
情态动词
不规则情态动词
is-was
are-were
am-was
go-went
do，does-did
bring-brought
make-made
have-had
run-ran
tell-told
eat-ate
get-got
draw-drew
put -put
read-read
take-took
die-died
see-saw
fly-flew
cut-cut
meet-met
tell-told
build-built
lend-lent
lose-lost
hear-heard
buy-bought
see-saw
choose-chose
forget-forgot
sink-sank
sing-sang
begin-began
swim-swam
ring-rang
drink-drank
fly-flew
draw-drew
lie-lay
wear-wore
know-knew
teach-taught
swim-swam
stand-stood
keep-kept
think-thought