一般加ed。当然有特殊情况,如下:原形
过去式 be
was/were
become
became
begin
began
break
broke
bring
brought
build
built
burn
burned,burnt
buy
bought
catch
caught
choose
chose
come
came
cost
cost
cut
cut
do
did .......太多太多了......反正这个只有死记硬背,没办法的,我初中时也背了好长时间呢.再给你说几个吧: lie
lay teach taught understand
understood throw
threw write
wrote wake
woke win won sleep
slept
...........