YOU SAID:
she saw some seashells on the seashore.
INTO JAPANESE
彼女は海岸でいくつかの貝殻を見ました。
BACK INTO ENGLISH
She saw some shells on the beach.
INTO JAPANESE
彼女は浜辺でいくつかの貝殻を見た。
BACK INTO ENGLISH
She saw some shells on the beach.
That didn't even make that much sense in English.