a swimmer doing a backstroke
A person sits on a bench.
A swimmer is swimming
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_do(e1) & n_backstroke(x3) & (x1 = x2) & n_swimmer(x1))
exists e1 x1 x2.(on(e1,x2) & n_bench(x2) & Actor(e1,x1) & v_sit(e1) & n_person(x1))