a boy smiles underwater.
A boy is smiling at his friend while they play underwater.
Just because, the boy smiles does not mean he smiles at his friend.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_smile(e1) & n_underwater(x2) & n_boy(x1))
exists e1 p1 x1 x2.(exists e2 x3.(Theme(e2,x3) & Actor(e2,x1) & v_play(e2) & n_underwater(x3)) & n_thing(x1) & while(e1,p1) & at(e1,x2) & n_friend(x2) & of(x2,x1) & n_male(x1) & Actor(e1,x1) & v_smile(e1) & n_boy(x1))