Four men do repair work on a roof.
Four men fixing a leaky roof.
There may be another reason for needing a repair apart from a leaky roof.
exists e1 x1 x2 x3 x4.(Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & on(x2,x4) & n_roof(x4) & n_work(x2) & of(x2,x3) & n_repair(x3) & n_man(x1) & card_eq_4(x1))
exists e1 s1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_fix(e1) & n_roof(x3) & a_leaky(s1) & Theme(s1,x3) & (x1 = x2) & n_man(x1) & card_eq_4(x1))