A man cooks outside on a grill.
A small child set his room on fire.
The subject is either a man or child, who either cooks or sets his room on fire.
exists x1 x2 x3 x4.(a_topic(x1) & on(x3,x4) & n_grill(x4) & outside(x1,x3) & n_thing(x3) & n_cook(x1) & of(x1,x2) & n_man(x2))
exists e1 s1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_set(e1) & on(x2,x3) & n_fire(x3) & n_room(x2) & of(x2,x1) & n_male(x1) & n_child(x1) & a_small(s1) & Theme(s1,x1))