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(dòng)詞，賓語(yǔ)可以是名詞、代詞或that從句。也可以接賓語(yǔ)后，再加以as 短語(yǔ)充當(dāng)?shù)馁e語(yǔ)補(bǔ)足語(yǔ)。

as 短語(yǔ)可以是：

as + 名詞

as + 形容詞

as + 目前分詞（假如目前分詞的動(dòng)作早于謂語(yǔ)動(dòng)詞，則要用完成體）

as + 過去分詞

as + 介詞短語(yǔ)

網(wǎng)友的句子是被動(dòng)語(yǔ)態(tài)：主語(yǔ) + 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(guó)西南部四川發(fā)生的森林失火中，已有30人被確認(rèn)死亡。