A man is sitting on the roof.
a man is on the roof because he is going to fix it
Just because a man is sitting on the roof doesn't mean he is going to fix it.
exists e1 x1 x2.(n_roof(x2) & on(e1,x2) & Actor(e1,x1) & v_sit(e1) & n_man(x1))
exists p1 p2 x1 x2.(n_male(x2) & n_roof(x2) & exists e1 p3.(Topic(e1,p3) & Actor(e1,x2) & v_go(e1) & exists e2.(Theme(e2,x1) & Actor(e2,x2) & v_fix(e2))) & n_thing(x1) & because(p1,p2) & on(x1,x2) & n_man(x1))