动词原形变过去式!动词原形：leave,study,stop,happen ,speak,argue,steal,hurry,report,ring,look,pick,fllow,hold,hurt,ride,walk,think,want,break,build,hear,spend,sit,meet,take,teach,hear

leave----left
study----studied
stop-----stopped or stopt
happen-----happened
speak-------spoke
argue----argued
steal-------stole
hurry------hurried
report-----reported
ring------rang
look------looked
pick-----picked
follow----followed
hold-----held
hurt-----hurt
ride------rode
walk------walked
think-----thought
want----wanted
break----broke
build-----built
hear-----heard
spend-----spent
sit-----sat
meet-----met
take-------took
teach-----taught
hear------heard

left,studied,stopped,happened,spoke,argued,stole,hurried,reported,rang,looked,picked,held,hurt,rode,walked,thought,wanted,broke,built,heard,spent,sat,met,took,taught,heard
(by the way你打了两个hear.)