A smiling child stands looking at pigeons.
The child is crying because of the pigeons.
One would not be smiling and crying at the same time.
exists e2 e1 x1 x2 x3.(at(e2,x3) & n_pigeon(x3) & Actor(e2,x1) & v_look(e2) & n_stand(x1) & of(x1,x2) & n_child(x2) & Actor(e1,x1) & v_smile(e1))
exists e1 x1 x2.(n_pigeon(x2) & n_child(x1) & of(e1,x2) & r_because(e1) & Actor(e1,x1) & v_cry(e1))