a lone rock climber climbing a rock wall
The climber is lonely because no one else is there.
Just because a lone rock climber is climbing it does not mean the climber is lonely because no one else is there.
exists e1 s1 x1 x2 x3 x4 x5.(a_topic(x1) & Theme(e1,x4) & Actor(e1,x3) & v_climb(e1) & n_wall(x4) & of(x4,x5) & n_rock(x5) & (x1 = x3) & n_climber(x1) & of(x1,x2) & n_rock(x2) & a_lone(s1) & Theme(s1,x1))
exists p1 s1 x1.(n_climber(x1) & -exists s2 x2.(Theme(s2,x2) & a_there(s2) & r_else(x2) & n_one(x2)) & because(s1,p1) & Theme(s1,x1) & a_lonely(s1))