Three people wearing white hard hats ride on a forklift.
one of them is wearing a blue hat
Three people wearing white hard hats mean that they are all wearing white hard hats. None of them can be wearing a blue hat.
exists e1 e2 s1 s2 x1 x2 x3 x4.(on(e2,x4) & n_forklift(x4) & Actor(e2,x1) & v_ride(e2) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_hat(x3) & a_hard(s2) & Theme(s2,x3) & a_white(s1) & Theme(s1,x3) & (x1 = x2) & n_people(x1) & card_eq_3(x1))
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_hat(x2) & a_blue(s1) & Theme(s1,x2) & of(x1,x2) & n_thing(x2) & n_thing(x1) & card_eq_1(x1))