Question

since his defeat,the minister had gone abroad.新二83课，好的加分！

his defeat是什么结构？
如果是动名词的复合结构，那么应该是his being defeated. 因为1，他是被击败了，2，复合结构应该是动名词ing形式。
刚才查了语法书，只有在逻辑主语与句子主语不一致的情况下才加物主代词，这里是一致的，为什么还要加His?
谢谢！

Answer 1

defeat此处应该是名词，“因为大选失败，首相去了国外。”可以理解为复合结构，since后面可以接动名词作状语，接名词作状语也是可以的。如果能帮到你，希望采纳为最佳答案！谢谢！

Answer 2

完整版：
When he asked if Mr Lane lived there, the policeman on duty told him that since
his defeat, the ex-Prime Minister had gone abroad.

翻译：当他询问雷恩先生是否住在那儿时，值班警察告诉他这位前首相落选后就到国外去了。

tell sb （that）引导双宾语从句。him是间宾，而that后面引导的部分为直宾，即告知了某事。
since在这儿是“因为”的意思，为介词，后面接名词做宾语。
defeat是“失败”，意指“大选失败”
his being defeated也行，但是名词含义的defeat也有“被击败”的意思。所以，无所谓啦
加his是为了使句子之间的关系更为明朗