YOU SAID:
I lost my keys in the house, I'll never get to work now!
INTO JAPANESE
私は家の中で鍵を紛失しました。
BACK INTO ENGLISH
I lost my key in the house.
INTO JAPANESE
私は家の中で鍵を失った。
BACK INTO ENGLISH
I lost my key in the house.
You've done this before, haven't you.