关于动名词短语作主语There is no doubt that helping students find a job is one of the primary functions of univeristy education.这句话我理解成同位语从句中套了主系表结构的句子,为什么用的是helping students find a job 而不是to find a job,我知道helping students是属于动名词短语作主语,这里用find难道不会导致在主系表这个句子里面,有两个主语,一个是find,一个是is,

关于动名词短语作主语
There is no doubt that helping students find a job is one of the primary functions of univeristy education.这句话我理解成同位语从句中套了主系表结构的句子,为什么用的是helping students find a job 而不是to find a job,我知道helping students是属于动名词短语作主语,这里用find难道不会导致在主系表这个句子里面,有两个主语,一个是find,一个是is,