A man is sitting on a scaffolding in front a white building.
A man is doing construction work in front of a white building.
Just because a man is sitting on scaffolding does not mean he is doing construction work.
exists e1 x1 x2.(all s1 x3.((n_building(x3) & a_white(s1) & Theme(s1,x3)) -> exists x4.(in(e1,x4) & for(x4,x3) & n_front(x4))) & on(e1,x2) & n_scaffolding(x2) & Actor(e1,x1) & v_sit(e1) & n_man(x1))
exists e1 s1 x1 x2 x3 x4 x5.(in(e1,x4) & of(x4,x5) & n_building(x5) & a_white(s1) & Theme(s1,x5) & n_front(x4) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_work(x2) & of(x2,x3) & n_construction(x3) & n_man(x1))