A group of girls walking and talking along the beach with a building in the background .
Some people are on the beach .
A group of girls walking and talking along the beach with a building in the background.
Some people are on the beach.
"Some people," is a rephrasing of, "a group of girls." If they are along the beach then they must be on the beach.
`` Some people , '' is a rephrasing of , `` a group of girls . '' If they are along the beach then they must be on the beach .