His studying hard leads to the success. 他的成功来自他的努力学习这里 his 是 形容词性物主代词， study 是动词，放在his 后面要加ing 构成名词性质的 studying。【楼主参考下~希望对你有帮助~】
His mother is doing housework now。他妈妈现在正在做家务。形容词性物主代词 His
