YOU SAID:

The fact that I lost my keys is the key to finding them.

INTO JAPANESE

私がキーを紛失したという事実は、それらを見つける鍵です。

BACK INTO ENGLISH

The fact that I lost my key is the key to finding them.

INTO JAPANESE

鍵を紛失したという事実が鍵を見つける鍵です。

BACK INTO ENGLISH

The fact that you lost your key is the key to finding the key.

INTO JAPANESE

キーを紛失したという事実がキーを見つける鍵です。

BACK INTO ENGLISH

The fact that the key has been lost is the key to finding the key.

INTO JAPANESE

鍵が失われたという事実が鍵を見つける鍵です。

BACK INTO ENGLISH

The fact that the key has been lost is the key to finding the key.