YOU SAID:
sally saw a seashell by the seashore
INTO JAPANESE
サリーは海岸で貝殻を見た
BACK INTO ENGLISH
Sally saw a seashell on the coast
INTO JAPANESE
サリーは海岸で貝殻を見た
BACK INTO ENGLISH
Sally saw a seashell on the coast
That didn't even make that much sense in English.