A young man is sitting next to the ornate building wall with the backpack on the ground and hiding his face in his hands.
A young man standing holding his backup in the air.
The man cannot be sitting and standing at the same time.  The backpack cannot be in the air and on the ground at the same time.  The man cannot hold his backpack and hide his face in his hands at the same time.
exists e1 e2 s1 s2 s3 x1 x2 x3 x4 x5 x6 x7 x8.(n_hand(x8) & of(x8,x2) & n_male(x2) & n_male(x2) & n_face(x7) & of(x7,x2) & n_ground(x5) & n_backpack(x4) & n_wall(x2) & of(x2,x3) & n_building(x3) & a_ornate(s2) & Theme(s2,x2) & in(e2,x8) & Theme(e2,x7) & Actor(e2,x6) & v_hide(e2) & n_man(x6) & a_young(s3) & Theme(s3,x6) & on(e1,x5) & with(e1,x4) & to(e1,x2) & r_next(e1) & Actor(e1,x1) & v_sit(e1) & n_man(x1) & a_young(s1) & Theme(s1,x1))
exists e1 s1 x1 x2 x3 x4 x5.(n_air(x5) & a_topic(x1) & in(e1,x5) & Theme(e1,x4) & Actor(e1,x3) & v_hold(e1) & n_backup(x4) & of(x4,x1) & n_male(x1) & (x1 = x3) & n_standing(x1) & of(x1,x2) & n_man(x2) & a_young(s1) & Theme(s1,x1))