open live sit study call
现在分词openning living sitting studying calling
三单形式opens lives sits studies calls
过去式 opens lived sitted studied callde
open live sit study call的现在分词、第三人称单数形式、过去式各是什么?
open live sit study call
现在分词openning living sitting studying calling
三单形式opens lives sits studies calls
过去式 opens lived sitted studied callde