make up one's mind to do和make up one's mind doing有什么不同?

第一个是下定决心要做,第二个下定决心做强调正在
再问： 可以举个栗子吗
再答： I made up my mind to study hard next team.我下定决心下个学期很努力学习；--where's Tom? --He makes up his mind doing his homework汤姆正下定决心地做作业呢