I felt sure I would never be able to close the case again.从句是不是虚拟语气

问题描述:

I felt sure I would never be able to close the case again.从句是不是虚拟语气

不是,只是一般过去将来时.
因为I felt sure,主句是过去时.
如果是虚拟语气,从句要用完成的,