想了解一些单词的过去式和过去分词答:shall,should,没过去分词 shine,shone,shined.show,showed,shown shut,shut,shut sing,sang,sung sink,sinked,sinked sit,sat,sat sleep,slept,slept smell,smelt ,smellt.speak,spoke,spoken spend,spent,spent,spit,spit ,spit stand,stood ,stood steal,stole.stolen sweep,swept,swept swim,swan...