A man is rock climbing.
A man is iceskating.
Rock climbing and iceskating are two different actions.
exists p1 x1.(exists x2 x3.((x1 = x2) & n_climb(x2) & of(x2,x3) & n_rock(x3)) & n_man(x1))
exists e1 x1.(Actor(e1,x1) & v_iceskate(e1) & n_man(x1))