An Asian man doing work on the shingles of a roof.
A person fixing a roof for a friend
Doing work on roof not implies he is doing work for him friend
exists e1 s1 x1 x2 x3 x4 x5.(n_shingle(x4) & a_topic(x1) & on(e1,x4) & of(x4,x5) & n_roof(x5) & Theme(e1,x3) & Actor(e1,x2) & v_do(e1) & n_work(x3) & (x1 = x2) & n_man(x1) & a_asian(s1) & Theme(s1,x1))
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_fix(e1) & for(x3,x4) & n_friend(x4) & n_roof(x3) & (x1 = x2) & n_person(x1))