A man is rock climbing.
A man climbs a rock.
"Climbs a rock" is a rephrasing of "is rock climbing".
exists p1 x1.(exists x2 x3.((x1 = x2) & n_climb(x2) & of(x2,x3) & n_rock(x3)) & n_man(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_climb(e1) & n_rock(x2) & n_man(x1))