YOU SAID:
She sell seashells by the sea shore
INTO JAPANESE
彼女は海岸で貝殻を売る
BACK INTO ENGLISH
She sells seashells by the seashore
INTO JAPANESE
彼女は海岸によって貝殻を販売します
BACK INTO ENGLISH
She sells seashells by the seashore
That didn't even make that much sense in English.