YOU SAID:

three can keep a secret if two of them are dead

INTO JAPANESE

2人が死んでも3人は秘密を守れる

BACK INTO ENGLISH

Even if two people die, three people can keep the secret.

INTO JAPANESE

たとえ2人が死んでも、3人なら秘密を守れる。

BACK INTO ENGLISH

Even if two people die, three people can keep the secret.