learn,cost,let ,may mean .它们的过去式是什么learn,cost,let ,may mean ,meet,sell,smell,speak,spend ,teach,think它们的过去式是什么
问题描述：
learn,cost,let ,may mean .它们的过去式是什么
learn,cost,let ,may mean ,meet,sell,smell,speak,spend ,teach,think它们的过去式是什么
答
learned
costed
leted
maied
meaned
meet
selled
smelled
speaked
spent
taught
thought
答
learned/learnt
cost
let
might
meant
met
sold
smelt
spoke
spent
taught
thought
答
learned
costed
leted
maied
meaned
met
selled
smelled
speaked
spent
taught
thought
答
learnt/learned
cost
let
might
meant
met
sold
smelt
spoke
spent
taught
thought
答
learn---learned/learntcost----costlet---let ,may----mightmean----meantmeet----metsell----soldsmell----smeltspeak-----spokespend----spentteach----taughtthink----thought
答
learnt/learned
cost
let
might
meant
met
sold
smelt
spoke
spent
taught
thought