A person in red sitting on a beach.
The person is at the beach.
One must be at the beach in order to be sitting on the beach.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x4) & n_beach(x4) & Actor(e1,x3) & v_sit(e1) & (x1 = x3) & Theme(s1,x2) & a_red(s1) & (x1 = x2) & n_person(x1))
exists p1 x1 x2.(n_beach(x2) & n_person(x1) & at(x1,x2))