A man wearing red is driving an old fire engine.
A man wearing pink is flying a UFO.
One can be wearing red or pink. You cannot fly and drive at the same time. The vehicle can be either a fire engine or a UFO.
exists e1 e2 s1 x1 x2 x3 x4 x5.(Theme(e2,x4) & Actor(e2,x1) & v_drive(e2) & n_engine(x4) & of(x4,x5) & n_fire(x5) & a_old(s1) & Theme(s1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_red(x3) & (x1 = x2) & n_man(x1))
exists e1 e2 x1 x2 x3 x4.(Theme(e2,x4) & Actor(e2,x1) & v_fly(e2) & ne_org_ufo(x4) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_pink(x3) & (x1 = x2) & n_man(x1))