A young man is sitting and posing for the camera.
Nobody is sitting.
A man cannot be sitting if nobody is sitting.
exists e1 e2 s1 s2 x1 x2 x3.(n_camera(x3) & for(e2,x3) & Actor(e2,x2) & v_pose(e2) & n_man(x2) & a_young(s2) & Theme(s2,x2) & Actor(e1,x1) & v_sit(e1) & n_man(x1) & a_young(s1) & Theme(s1,x1))
-exists e1 x1.(Actor(e1,x1) & v_sit(e1) & n_person(x1))