A boy climbing a mountain.
There is a boy in this picture
The person defined as climbing a mountain is a boy.
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_climb(e1) & n_mountain(x3) & (x1 = x2) & n_boy(x1))
exists p1 x1 x3.(n_picture(x3) & exists x2.((x1 = x2) & in(x2,x3) & n_boy(x2)))