YOU SAID:

if you have to go away then dont leave your fish in the trouser shelf

INTO JAPANESE

離れなければならない場合は、ズボンの棚に魚を置いたままにしないでください

BACK INTO ENGLISH

If you have to leave, do not leave fish on the pants shelf

INTO JAPANESE

あなたが去らなければならない場合、ズボンの棚に魚を残さないでください

BACK INTO ENGLISH

If you have to leave, do not leave fish on the pants shelf