stady、stop、leave、help、say、see、call、pick、buy的现在分词和过去式、过去分词

stady 不才，没见过
stopping stopped stopped
leaving left left
helping helped helped
saying said said
seeing saw saw
calling called called
picking picked picked
buying bought bought

stop-stopping-stopped-stopped
leave-leaving-left-left
help-helping-helped-helped
say-saying-said-said
see-seeing-saw-seen
call-calling-called-called
pick-picking-picked-picked
buy-buying-bought-bought
stady这个词是不是打错了？
应该是study吧？
study-studying-studied-studied

应该是study吧?study-studying-studied-studiedstop-stopping-stopped-stoppedleave-leaving-left-lefthelp-helping-helped-helpedsay-saying-said-saidsee-seeing-saw-seencall-calling-called-calledpick-picking-...

stop:stopping,stopped,stopped
leave:leaving,left,left
say:saying,said,said
see:seeing,saw,seen
call:calling,called,called
buy:buying,bought,bought
pick:picking,picked,picked