YOU SAID:
I have lost my marbles
INTO JAPANESE
私は大理石を失っています。
BACK INTO ENGLISH
I am lost marble.
INTO JAPANESE
大理石をなくした
BACK INTO ENGLISH
Lost marble
INTO JAPANESE
白大理石
BACK INTO ENGLISH
Marble
INTO JAPANESE
白大理石
BACK INTO ENGLISH
Marble
You've done this before, haven't you.