规则动词过去式的构成
(1)直接在动词后加ed
如:clean—cleaned;milk—milked;play—played;
(2)以e结尾的直接加d
如:dance—danced;taste—tasted;
(3)以辅音字母加y结尾的改y为i加ed
如:study—studied;carry—carried;
(4)双写词尾加ed
如:stop—stopped;jog—jogged;
不规则的有:am,is—was;are—were;do,does—did;have,has—had;go—went;meet—met;sit—sat;see—saw;get—got;tell—told;run—ran;come—came;steal—stole;read—read;