cut -- cutting 切put-- putting 放swim -- swimming 游泳begin -- beginning 开始get -- getting 得到，获得forget -- forgetting 忘记hit -- hitting 打，击，撞spit -- spitting 吐痰hiccup -- hiccupping 打嗝run -- running 跑sit -- sitting 坐babysit -- babysitting 临时照看婴儿split -- splitting 分裂