we have finished our homework 改为被动语态

问题描述:

we have finished our homework 改为被动语态
是不是应该是:Homework had been finised by us

Our homework has been finished by us.
原句是现在完成时,改成被动语态当然还是现在完成时,改为被动后homework做了主语,homework是单数,所以是has been