YOU SAID:
She sell seashells at the sea shore
INTO JAPANESE
彼女は海岸で貝殻を売る
BACK INTO ENGLISH
She sells shells on the coast
INTO JAPANESE
彼女は海岸で貝殻を売っている
BACK INTO ENGLISH
She is selling seashells on the coast
INTO JAPANESE
彼女は海岸で貝殻を売っています
BACK INTO ENGLISH
She sells shells on the coast
INTO JAPANESE
彼女は海岸で貝殻を売っている
BACK INTO ENGLISH
She is selling seashells on the coast
INTO JAPANESE
彼女は海岸で貝殻を売っています
it is unlikely that this phrase will ever reach equilibrium