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动词如何加ED1．把动词原形中的i改为a，变成过去式。如：begin—began，drink—drank，give—gave，ring—rang，sing—sang，sit—sat，swim—swam2．把重读开音节中的i改为o，变成过去式。如：drive—drove，ride—rode，write—wrote3．改动词原形中的aw／ow为ew，变成过去式。如：draw—drew，grow—grew，know—knew，throw—threw（动词show除外，show—showed）4．动词原形中的e改为o，变成过去式。如：get—got，forget—forgot5．动词原形中的ee改为e，变成过去式。如：feed—fed，meet—met6．动词原形中的eep改为ept，变成过去式。如：keep—kept，sleep—slept，sweep—swept7．动词原形中的eak改为oke，变成过去式。如：break—broke，speak—spoke8．动词原形中的ell改为old，变成过去式。如：sell—sold，tell—told9．动词原形中的an改为oo，变成过去式。如：stand—stood，understand—understood10．以ought和aught结尾，且读音是〔:t〕的过去式。如：bring—brought，buy—bought，think—thought，catch—caught，teach—taught11．以ould结尾且读音为〔ud〕的情态动词过去式。如：can—could，shall—should，will—would12．把动词原形中的o改为a，变成过去式。如：come—came，become—became13．在动词原形后加d或t变成过去式，并且发生音变。如：hear〔hi〕—heard〔h:d〕，say〔sei〕—said〔sed〕，mean〔mi:n〕—meant〔ment〕14．动词的过去式与动词原形一样。如：let—let，must—must，put—put，read—read〔red〕15．不符合上述规律的动词过去式。如：am，is—was，are—were，build—built，do—did，eat—ate，fall—fell，feel—felt，find—found，fly—flew，go—went，have／has—had，hold—held，leave—left，make—made，may—might，run—ran，see—saw，take—took