A man climbs down a scaffolding.
A man is climbing
Climbs down is present tense, climbing is the gerund for the same action.
exists e1 s1 x1 x2.(a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_climb(e1) & n_scaffolding(x2) & n_man(x1))
exists e1 x1.(Actor(e1,x1) & v_climb(e1) & n_man(x1))