his being late 是带有逻辑主语的动名词复合结构.这种结构由 “所有格 + 动名词短语” 构成,用来作主语或宾语,用作宾语时也可以用宾格代替所有格.如:
(The teacher’s coming late) caused the class disordered.老师迟到造成课堂的骚动.(主语)
He suggested (our/us making a plan).他建议我们制定一个计划.(动词宾语)
He didn't tell me the reason for (his/him being late).他没有告诉我他迟到的理由.(介词宾语)