YOU SAID:
she sells sea shells on the sea shore. The shells she sells are sea shells i'm sure
INTO JAPANESE
彼女は海岸で貝殻を売っています。彼女が売っている貝は海の貝だ
BACK INTO ENGLISH
She is selling shells at the beach. The shellfish she is selling is a sea shell
INTO JAPANESE
彼女は浜で貝を売っています。彼女が売っている貝は海の貝
BACK INTO ENGLISH
She is selling shellfish at the beach. The shellfish she is selling is a seashell
INTO JAPANESE
彼女は浜で貝を売っています。彼女が売っている貝は貝です
BACK INTO ENGLISH
She is selling shellfish at the beach. The shellfish she is selling is shellfish
INTO JAPANESE
彼女は浜で貝を売っています。彼女が売っている貝は貝です
BACK INTO ENGLISH
She is selling shellfish at the beach. The shellfish she is selling is shellfish
That didn't even make that much sense in English.