语法分析I can't ensure his being on time.I can't ensure his being on time.这句话为什么要用being?请达人整个句子帮我分析下

语法分析I can't ensure his being on time.
I can't ensure his being on time.这句话为什么要用being?请达人整个句子帮我分析下

主谓宾结构.
1、情态动词加动词原形,是谓语
2、his being on time是宾语
3、物主代词+动名词短语作宾语