A boy holds his hands on his head.
A boy has a headache
You do not know that the boy has a headache and that that is why he is holding his head.
exists e1 x1 x2 x3.(on(e1,x3) & n_head(x3) & of(x3,x1) & n_male(x1) & n_male(x1) & Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_hand(x2) & of(x2,x1) & n_boy(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_headache(x2) & n_boy(x1))