求六年级应掌握的过去式和动词ing形式(正在进行时)的单词(要全面些,但 ...答:break—broke,speak—spoke 8.动词原形中的ell改为old,变成过去式。如: sell—sold,tell—told 9.动词原形中的an改为oo,变成过去式。如: stand—stood,understand—understood 10.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—taught 11....