谁知道am,is,are,do,does,have,has,go,come,see,win,run,make,fly,put...答:13.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—...