playing running swimming making going liking writing skiing reading having singing dancing putting seeing buying
除了特殊的游泳,跑步等,别的都加ing,末尾是e的要去e加ing
游泳,跑步的双写是因为在闭音节词中,需要双写末尾字母,再加ing变分词结构.如,sitting,running putting
楼上的错了...