改被动句 英语 We found some jewels in a box.The teacher  keeps the

为你解答.
1、We found some jewels in a box.
Some jewels were found by us in a box.
2、The teacher keeps the pupils at school for a revision.
The pupils are kept at school by the teacher for a revision.
3.They make a parcel for you.
A parcel is made by them for you.
4.You must finish the article before Friday.
The article must be finished by you before Friday.
5.They will paint the house again next year.
The house will be painted by them again next year.