Some jewels were found in a box by us.我不是叫你帮我改这个句子，是帮我找这个习题的答案，我只是举了其中一个题- - 。你说的练习题在哪啊? 我只看到了这一个题. 请说明白一些.我的意思不是叫你帮我改这一个句子，而是叫你帮我找这个题后面的题，有很多道，然后我要那些题得答案....不懂就继续追问我吧.....动句转被动句1 his mother told him not to waste time on fishing.2 Father gave me a toy at Christmas.3 This factory produces machine tools.4 They should do it at once.5 He is likely to let you down.6 They named the child tom.答案1 He was told not to waste time on fishing (by his mother).2 I was given a toy at Christmas (by my father).3 Machine tools are produced in this factory.4 It should be done at once (by them).5 You are likely to be let down.6 The child was named tom.以上几个例子都是从语法书摘抄的。代表了几种不同形式的被动变法。1\2是不同的动宾短语中宾语变被动；3是一般句子变被动；4是情态动词变被动；5是不定式变被动；6是主—动—宾—补结构的主动句变被动。