YOU SAID:
Sally sells sea shells at the sea shore.
INTO JAPANESE
サリーは海岸で貝殻を売っている。
BACK INTO ENGLISH
Sally sells seashells on the beach.
INTO JAPANESE
サリーはビーチで貝殻を売っています。
BACK INTO ENGLISH
Sally sells seashells on the beach.
That didn't even make that much sense in English.