A girl standing in the ocean
Some people are at the beach.
One girl does not imply some people. The girl could be standing in the ocean somewhere other than a beach.
exists x1 x2 x3.(n_ocean(x3) & a_topic(x1) & in(x1,x3) & n_standing(x1) & of(x1,x2) & n_girl(x2))
exists p1 x1 x2.(n_beach(x2) & at(x1,x2) & n_people(x1))