Three workers are working on a metal roof
The workers are repairing a metal roof that was damaged when a branch fell on it.
Working on a roof does not necessarily mean one is repairing it, nor does it mean the roof was damaged when a branch fell.
exists e1 x1 x2 x3.(on(e1,x2) & n_roof(x2) & of(x2,x3) & n_metal(x3) & Actor(e1,x1) & v_work(e1) & n_worker(x1) & card_eq_3(x1))
exists e1 e2 p1 x1 x2 x3 x4.(n_thing(x1) & n_worker(x1) & Theme(e2,x2) & Actor(e2,x1) & v_repair(e2) & exists e3 x5.(on(e3,x1) & Actor(e3,x5) & v_fall(e3) & n_branch(x5)) & when(e1,p1) & Theme(e1,x4) & v_damage(e1) & (x2 = x4) & n_roof(x2) & of(x2,x3) & n_metal(x3))