改为被动语态：I saw him go into the classrom.2did he buy you the book you wanted

改为被动语态：I saw him go into the classrom.2did he buy you the book you wanted

1 He was seen to go into the classroom
2 Were you bought the book that you wanted ? (这句好) ///
Was the book that you wanted bought for you (这句貌似不是英语的表达)
3 Who is the old granny often taken care of by ? ///
By whom is the old granny often taken care of ?追问Was the book that you wanted bought for you (这句貌似不是英语的表达)
为什么不是英语的表达追答因为不简洁，不干脆，结构太复杂。英语民族人士不可能这样表达，尽管语法没有问题。

I saw him go into the classrom.---》被动句 ： He was seen to go into the classroom (by me).
2did he buy you the book you wanted?--->被动句： Were you bought the book you wanted (by him)?
3.who often takes care of the old granny?--->被动句 By whom is the old granny taken care of ?
备注：被动语态改写 主要是关注 句子的时态以及 句子中的宾语结构。追问see后不是接DOING STH吗？第二句如果THE BOOK做主语改被动呢？追答see somebody do sth 看见某人做了某事 ， 如果是doing ，就是正在做某事， 因为 go into 是瞬间性动词，所以通常在非谓语中不采用进行的形式。

第二句的另一种改写 Was the book that you wanted bought for you （by him)?
较少使用 ，因为“头重脚轻”， 主语还带了定语从句，另外 buy sth for somebody 中，很容易漏掉介词for 。

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