fall fell fallen
lose lost losen
find found found
leave left left
tell told told
send sent sent
spend spent spent
buy bought bought
sleep slept slept
fell,lost,found,left,told,sent,spent,bought,slept的原形是什么?
fall fell fallen
lose lost losen
find found found
leave left left
tell told told
send sent sent
spend spent spent
buy bought bought
sleep slept slept