A man is on a roof doing construction.
The man is sitting on the porch, drinking lemonade.
Person that is sitting on a porch can not be on the roof doing construction, at the same time.
exists p1 x1.(exists e1 x2 x3 x4.(on(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_do(e1) & n_construction(x4) & (x2 = x3) & n_roof(x2)) & n_man(x1))
exists e1 x1 x2 x3 x4.(n_porch(x2) & n_man(x1) & rel(e1,x3) & n_lemonade(x3) & of(x3,x4) & n_drinking(x4) & on(e1,x2) & Actor(e1,x1) & v_sit(e1))