过去式,动词ING ,第三人称单数1 dropped ,dropping drops2 ran running runs3 swam swimming swims4 rang ringing rings5 went going goes6 did doing does7 saw seeing sees8 sent sending sends9 came coming come...
过去式,动词ING ,第三人称单数1 dropped ,dropping drops2 ran running runs3 swam swimming swims4 rang ringing rings5 went going goes6 did doing does7 saw seeing sees8 sent sending sends9 came coming come...