A smiling youth in a blue shirt is posing on some outdoor stairs.
Nobody is smiling.
A smiling youth cannot be nobody smiling simultaneously.
exists e2 e1 s1 s2 x1 x2 x3.(on(e2,x3) & n_stair(x3) & a_outdoor(s2) & Theme(s2,x3) & Actor(e2,x1) & v_pose(e2) & in(x1,x2) & n_shirt(x2) & a_blue(s1) & Theme(s1,x2) & n_youth(x1) & Actor(e1,x1) & v_smile(e1))
-exists e1 x1.(Actor(e1,x1) & v_smile(e1) & n_person(x1))