YOU SAID:

He is dead as a doornail

INTO JAPANESE

彼はつけっぱなしとして死んでいます。

BACK INTO ENGLISH

As he left, has died.

INTO JAPANESE

彼は左が死亡しました。

BACK INTO ENGLISH

He died has been left.

INTO JAPANESE

彼は死んだままになっています。

BACK INTO ENGLISH

He is dead;

INTO JAPANESE

死んでるよ

BACK INTO ENGLISH

He is dead.

INTO JAPANESE

死んでるよ

BACK INTO ENGLISH

He is dead.