一般是动词后加ed
不规则动词
am/is was fall fell find found fly flew
are were forget forgot get got give gave
become became go went have/has had
begin began hear heard keep kept know knew
bring brought lose lost say said sit sat
buy bought run ran put put read read
build built swim swam speak spoke wear wore
can caught meet met make made sing sang
come came pay paid see saw sell sold
cost cost do/does did
cut cut draw drew
drink drank
drive drove
eat ate
