be-being see-seeingflee-fleeingage-ageingagree-agreeingdisagree-dosagreeingcanoe-canoeingdye-dyeingeye-eyeingfree-freeingguarantee-guaranteeingknee-kneeingpee-peeingreferee-refereeingtree-treeing
最后一个不是动词。。。。。
seeing,being