YOU SAID:

I am going to fall down the stairs and die

INTO JAPANESE

階段から落ちて死ぬよ

BACK INTO ENGLISH

I'll fall down the stairs and die.

INTO JAPANESE

階段から落ちて死んでしまいます。

BACK INTO ENGLISH

He falls down the stairs and dies.

INTO JAPANESE

彼は階段から落ちて死亡します。

BACK INTO ENGLISH

He falls down the stairs and dies.