Three workers in white hard hats ride on an orange forklift.
The workers are wearing protective head gear.
white hard hats is inferred as  wearing protective head gear.
exists e1 s1 s2 x1 x2 x3 x4.(on(e1,x3) & n_forklift(x3) & of(x3,x4) & n_orange(x4) & Actor(e1,x1) & v_ride(e1) & in(x1,x2) & n_hat(x2) & a_hard(s2) & Theme(s2,x2) & a_white(s1) & Theme(s1,x2) & n_worker(x1) & card_eq_3(x1))
exists e1 s1 x1 x2 x3.(n_worker(x1) & Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_gear(x2) & of(x2,x3) & n_head(x3) & a_protective(s1) & Theme(s1,x2))