james has left a parcel for you.
改为：A parcel has been left you by James.
结构：have/ has +been + done
you must finish the article before friday.
改为：The article must be finished by you before Friday.
结构：情态动词+be+done
they will not paint the house again next year.
改为：The house will not be painted again by them next year.
结构：情态动词+be+done
they promised Mary a new doll for her birthday.
改为：A new doll was promised for Mary's birthday by them.
结构：was/were+done
I have told the children many times not to skate on the pond,
改为：The children have been told many times not to skate on the pond by me.
结构：have/ has +been + done
别忘了 不懂得要记得追问哦