动词过去式
1、不规则变化
am\ is—was are—were do—did go—went see—saw eat—ate sweep—swept sleep—slept have—had make—made get—got swim—swam fly—flew draw—drew write—wrote study—studied run—ran fight—fought swing—swung drink—drank take—took ride—rode catch—caught teach—taught will—would can—could
sing—sang take—took buy—bought find—found stop—stopped read—read
2、过去式与原形一样
set—set hurt—hurt put—put
3、规则变化
look—looked visit—visited cook—cooked water—watered clean—cleaned watch—watched wash—washed play—played climb—climbed skate—skated like—liked walk—walked plant—planted answer—answered listen—listened jump—jumped
pick—picked count—counted collect—collected plant—planted wait—waited turn—turned dive—dived live—lived work—worked row—rowed learn—learned dance—danced
