把下面的句子变为被动语态``要讲解`(英语高手进)

1.We found some jewels in a box
2. The teacher is keeping the pupils at school for a revision.
3. James has left a parcel for you.
4. You must finish the article before Friday.
(要将解)
要讲解 要讲解

讲解：
宾语变主语，根据原来句子选择是现在时，过去时，还是将来时，根据被动句的主语选择是用单数还是复数.
答案如下：
1 Some jewels are found in a box
2 The pupils are being kept at school by the teacher for a revision
3 A parcel has been left for you by James
4 The article must be finished before Friday

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