A man in blue jeans and a white t-shirt is standing on scaffolding reaching out to the ladder.
A guy climbing ladder to catch something on the roof.
A man standing on scaffolding reaching out to the ladder may not always want to catch something on the roof; he may want to do something else.
exists e2 e1 p1 s1 s2 x1 x2 x3 x4 x5 x6.(n_ladder(x6) & on(e1,e2) & exists e3 s3.(a_out(s3) & Manner(e3,s3) & to(e3,x6) & Actor(e3,x5) & v_reach(e3)) & Topic(e2,p1) & Actor(e2,x5) & v_scaffold(e2) & Actor(e1,x1) & v_stand(e1) & subset_of(x4,x1) & n_t-shirt(x4) & a_white(s2) & Theme(s2,x4) & subset_of(x2,x1) & in(x2,x3) & n_jeans(x3) & a_blue(s1) & Theme(s1,x3) & n_man(x2))
exists e1 p1 x1 x2 x3 x4 x6.(n_roof(x6) & a_topic(x1) & Topic(e1,p1) & exists e2 x5.(Theme(e2,x5) & Actor(e2,x2) & v_catch(e2) & on(x5,x6) & n_thing(x5)) & Theme(e1,x4) & Actor(e1,x3) & v_climb(e1) & n_ladder(x4) & (x1 = x3) & (x1 = x2) & n_guy(x1))