Four men in their 10s were dead when their car slammed into a utility pole.

英訳に間違いが有れば正してください。

乗っていた車が電柱に突っ込んで、10代の男性4人が死んだ。
Four men in their 10s were dead when their car slammed into a utility pole.

ヒント
突っ込んで死んだ

答え were deadをdiedにする

Four men in their 10s died when their car slammed into a utility pole.

形容詞 dead は死んでいる状態を表す

Four men in their 10s were dead when their car slammed into a utility pole.
だと
電柱に突っ込んだときには死んだ状態だったという意味になってしまう。

He was dead when emergency medical services arrived.
彼は緊急医療サービスが到着したときには既に死んでいた。

I will die when the medication eventually stops working.
最終的に薬が効かなくなったら私は死ぬ。