A man putting shingles on a roof.
A man is on the roof.
If he is putting shingles on a roof, then he is on the roof.
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x4) & n_roof(x4) & Theme(e1,x3) & Actor(e1,x2) & v_put(e1) & n_shingle(x3) & (x1 = x2) & n_man(x1))
exists p1 x1 x2.(n_roof(x2) & on(x1,x2) & n_man(x1))