YOU SAID:
i owe you fifty thosands lego bricks
INTO JAPANESE
私はあなたに50千のレゴブロックを借りています
BACK INTO ENGLISH
I owe you 50,000 lego blocks
INTO JAPANESE
私はあなたに50,000レゴブロックを借りています
BACK INTO ENGLISH
I owe you 50,000 lego blocks
That didn't even make that much sense in English.