A young boy is cooking lunch on the grill.
A child is cleaning a grill.
A boy is cooking versus a child cleaning.
exists p1 s1 x1 x3.(n_grill(x3) & exists s2 x2.((x1 = x2) & on(x2,x3) & n_lunch(x2) & a_cooking(s2) & Theme(s2,x2)) & n_boy(x1) & a_young(s1) & Theme(s1,x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_clean(e1) & n_grill(x2) & n_child(x1))