Two people sit on sand with many buildings behind them.
They are at the beach.
The sand on which the people sit could be in a playground sand box, not a beach.
exists e1 x1 x2 x3.(behind(e1,x1) & n_thing(x1) & with(e1,x3) & n_building(x3) & n_quantity(x3) & on(e1,x2) & n_sand(x2) & Actor(e1,x1) & v_sit(e1) & n_people(x1) & card_eq_2(x1))
exists p1 x1 x2.(n_beach(x2) & n_thing(x1) & at(x1,x2))