YOU SAID:
Jeffery lost his shoe in the big shopping mall
INTO JAPANESE
ジェフリーは大きなショッピングモールで靴を失った
BACK INTO ENGLISH
Jeffrey lost his shoes at a big shopping mall
INTO JAPANESE
ジェフリーは大きなショッピングモールで靴を失った
BACK INTO ENGLISH
Jeffrey lost his shoes at a big shopping mall
That didn't even make that much sense in English.