A man wearing a helmet is driving a go-cart.
A man drives a go kart in a race.
Driving a goat go kart doesn't necessarily mean it's a race.
exists e2 e1 x1 x2 x3 x4.(Theme(e2,x4) & Actor(e2,x1) & v_drive(e2) & n_go-cart(x4) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_helmet(x3) & (x1 = x2) & n_man(x1))
exists e1 x1 x2 x3 x4.(in(e1,x4) & n_race(x4) & Theme(e1,x2) & Actor(e1,x1) & v_drive(e1) & n_kart(x2) & of(x2,x3) & n_go(x3) & n_man(x1))