YOU SAID:
she sells sea shells on the sea shore, but the shells that she sells are sea shells, i'm sure.
INTO JAPANESE
彼女は海岸で貝を売っていますが、彼女が売っている貝は貝です。
BACK INTO ENGLISH
She sells shellfish on the beach, but the shellfish she sells is shellfish.
INTO JAPANESE
彼女はビーチで貝を売っていますが、彼女が売っている貝は貝です。
BACK INTO ENGLISH
She sells shellfish on the beach, but the shellfish she sells is shellfish.
You've done this before, haven't you.