Watched一般情况，加-ed
以e结尾，直接加-d
辅音字母加y结尾，改y为i再加-ed
重读闭音节结尾，末尾只有一个辅音字母，双写辅音字母，再加-ed
以r结尾，且末尾重读的，双写r加-ed

watch（过去式）

watch（过去式）-watched

drink（过去式）-drank


swim（过去式）-swam
listen（过去式）-listened

make（过去式） -made


get（过去式）-got
taste（过去式）-tasted

play（过去式） -played


say（过去式）-said
like（过去式）-liked

go（过去式）-went


tell（过去式）-told
pick（过去式）-picked

see（过去式）-saw


run（过去式）-run
cook（过去式）- cooked

stop（过去式）-stopped


give（过去式）-gave
collect（过去式) -collected
sweep（过去式）-swept


know（过去式）-knew
try（过去式）-tried

come（过去式） -came


take（过去式）-took
carry（过去式）-carried

read（过去式）-read
sing（过去式）-song

write（过去式）-wrote