A man laying on the roof attempting to rebuild it.
A man is trying to rebuild his own roof.
A man laying on the roof attempting to rebuild it does not imply that he is trying to rebuild his own roof.
exists e2 e1 p1 x1 x2 x3 x4.(n_thing(x3) & n_roof(x3) & a_topic(x1) & on(e1,x3) & Topic(e2,p1) & Actor(e2,x4) & v_attempt(e2) & exists e3.(Theme(e3,x3) & Actor(e3,x4) & v_rebuild(e3)) & (x3 = x4) & Actor(e1,x2) & v_lay(e1) & (x1 = x2) & n_man(x1))
exists e1 p1 s1 x1 x2.(Topic(e1,p1) & Actor(e1,x1) & v_try(e1) & exists e2.(Theme(e2,x2) & Actor(e2,x1) & v_rebuild(e2)) & n_roof(x2) & a_own(s1) & Theme(s1,x2) & of(x2,x1) & n_male(x1) & n_man(x1))