A man on the side of a steep roof doing some work.
A man on a ladder handing shingles up to another man on a roof.
Another man implies that there are two me. There can either be a single man or two men.
exists e1 s1 x1 x2 x3 x4 x5.(n_side(x2) & a_topic(x1) & on(x1,x2) & of(x2,x3) & Theme(e1,x5) & Actor(e1,x4) & v_do(e1) & n_work(x5) & (x3 = x4) & n_roof(x3) & a_steep(s1) & Theme(s1,x3) & n_man(x1))
exists e1 s1 x1 x2 x3 x4 x5.(a_up(s1) & Manner(e1,s1) & to(e1,x4) & on(x4,x5) & n_roof(x5) & n_man(x4) & -(x4 = x1) & n_man(x1) & n_man(x1) & Actor(e1,x1) & v_shingle(e1) & on(x1,x2) & n_handing(x2) & of(x2,x3) & n_ladder(x3))