Thirty people have been confirmed as having died while battling a forest fire in southwest Chinas Sichuan Province ,authorities said Monday.
老师，红色部分的句子成分怎么样理解，没while可以吗？
confirm 的使用方法：
confirm 是及物动词，宾语可以是名词、代词或that从句。也可以接宾语后，再加以as 短语充当的宾语补足语。
as 短语可以是：
as + 名词
as + 形容词
as + 目前分词（假如目前分词的动作早于谓语动词，则要用完成体）
as + 过去分词
as + 介词短语
网友的句子是被动语态：主语 + be + confrmed as...
Thirty people have been confirmed as having died while battling a forest fire in southwest Chinas Sichuan Province,authorities said Monday.
官方周一表示，在扑灭中国西南部四川发生的森林失火中，已有30人被确认死亡。