A group of people running on a beach at dawn.
A group of seagulls flies over the beach at dusk.
There can be either people or seagulls. One who is running is usually not one who flies. There can be either dawn or dusk.
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & of(x1,x2) & at(e1,x5) & n_dawn(x5) & on(e1,x4) & n_beach(x4) & Actor(e1,x3) & v_run(e1) & (x2 = x3) & n_people(x2) & n_group(x1))
exists e1 x1 x2 x3 x4.(n_beach(x3) & at(e1,x4) & n_dusk(x4) & over(e1,x3) & Actor(e1,x1) & v_fly(e1) & of(x1,x2) & n_seagull(x2) & n_group(x1))