推荐回答（6个）
你的句子是正确的！！！
总结一下：
变被动态的时候，当主动句没有第四格宾语的时候，此时变成无人称被动态。句子可以用ES做形式主语。动词一律是单数第三人称变位。
z.B.
a. Morgen diskutieren wir darüber nochmal.
Darüber wird morgen nochmal diskutiert.
b. Er hat uns beim Lernen viel geholfen.
Uns ist beim Lernen viel geholfen worden.
最后还要注意的是那些不能变成被动的表达，比如天气现象，比如反身动词，等等。
这句是没有第四个宾语的被动态.
可以改为
Es wird seinen kollegen fur ihre geschenke gedacht.
你的也对啊。
第三格要变
因为在被动句里 seine Kollegen(这里应该是复数吧 因为如果是单数 就得是für seine Geschenke,而不是ihre Geschenke) 是主语，所以要用第一格：
Für ihre Geschenke werden seine Kollegen von Herrn Bode gedankt.
不过这样有点儿怪，可以说：
Die Kollegen von Herrn Bode werden von ihm für ihre Geschenke gedankt.
首先肯定你改地很对！
主动态与被动态转换原则如下：
1.原主动句中第四格宾语在变成被动态的时候要变成主语（第一格）
2.原主动句的主语（施动者）在被动句中由von或durch引导外，其他的成分都不需要变换
3.一般 von+人； durch+物
以上是我在学习中总结的一点经验，希望能帮助你理解。
Die Kollegen von Herr Bode werden für ihre Geschenke gedankt.
seinen kollegen 是die Kollegen 的第三格，在被动态做主语时要改为第一格。
楼主改的单复数用错了，其他的都对。
这是无人称被动态，有两种改法：
1，如你所改
2，Es wird von Herrn Bode seinen Kollegen für ihre Geschenke gedankt.
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