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谁来帮我分析一个高中英语句子

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谁来帮我分析一个高中英语句子
The mother didn't know who to blame for the broken glass as it happened while she was out.
who为什么不能改为whom?blame为什么没有使用被动结构?
句子中缺少的不是宾语吗?为什么是缺少主语?
谁来帮我分析一个高中英语句子
这是宾语从句的缩略句型,很常见. 常用于know, teach, learn, expect, think 动词后.
以疑问词+to do的结构出现.
如: I don't know how to do it.
相当于: I don't know how I should do it.
所以这句话也相当于:The mother didn't know who should be to blame for the broken glass as it happened while she was out.
WHO 在这个宾语从句中充当主语. sb be to blame.这是个句型. 不能用whom