do的过去式是什么答:(12)动词的过去式与动词原形一样。如: let—let,must—must,put—put,read—read 〔red〕(13)以辅音字母+y结尾的动词,把y变成i,再加——ed,例如:study-studied 学习 (14)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,...
动词原型怎么变动词过去式?答:在动词原形后加d或t变成过去式,而且发作音变。如:hear〔hi 〕—heard〔h :d〕, say〔sei〕—said〔sed〕,mean〔mi:n〕—meant〔ment〕; 动词的过去式与动词原形一样。如:let—let,must—must,put—put,read—read〔red〕; 不符合上述规矩的动词过去式。如:am,is—was,are—were,build—built,do—...