Two men are working on bicycles.
The men are repairing cars.
Repairing cars is different then working on bicycles.
exists e1 x1 x2.(on(e1,x2) & n_bicycle(x2) & Actor(e1,x1) & v_work(e1) & n_man(x1) & card_eq_2(x1))
exists e1 x1 x2.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_repair(e1) & n_car(x2))