重读闭音节,双写最后一个辅音字母,再加-ing（辅元辅结构的）
1.sit- sitting 做 2.hop - hopping 单脚跳 3.swim- swimming 游泳 4.run - running 跑 5.cut – cutting 切 6.put – putting 放 7．get-getting 得到 8.shop-shopping 购物 9.skip-skipping 跳绳 10.begin-beginning 开始 11.forget-forgetting 12.stop-stopping 13.travel-travelling