Victors apologized for his not being able to inform me of the change.想知道介词后面的词为什么是his,正常情况下介词后面不是加宾格吗?

for his not being able to inform me of the change = for that he was not able to inform me of the change还是不懂for his not being able to inform me of the change 因为for 后面应该跟名词、代词或分词短语。his not being able to inform me of the change 就是分词短语。