A man sitting on top of an unfinished structure.
A man is sitting on an structure in progress.
Unfinished structure can be described as a structure in progress.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x3) & of(x3,x4) & n_structure(x4) & a_unfinished(s1) & Theme(s1,x4) & n_top(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_man(x1))
exists e1 x1 x2 x3.(in(e1,x3) & n_progress(x3) & on(e1,x2) & n_structure(x2) & Actor(e1,x1) & v_sit(e1) & n_man(x1))