Thirty people have been confirmed as having died while battling a forest fire in southwest Chinas Sichuan Province ,authorities said Monday.

老師，紅色部分的句子成分怎么樣理解，沒while可以嗎？

confirm 的使用方法：

confirm 是及物動詞，賓語可以是名詞、代詞或that從句。也可以接賓語后，再加以as 短語充當?shù)馁e語補足語。

as 短語可以是：

as + 名詞

as + 形容詞

as + 目前分詞（假如目前分詞的動作早于謂語動詞，則要用完成體）

as + 過去分詞

as + 介詞短語

網(wǎng)友的句子是被動語態(tài)：主語 + 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，在撲滅中國西南部四川發(fā)生的森林失火中，已有30人被確認死亡。