Two people riding a motorcycle.
Two humans drive a motorbike.
People are humans, people ride and drive a motorcycle.
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_motorcycle(x3) & (x1 = x2) & n_people(x1) & card_eq_2(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_drive(e1) & n_motorbike(x2) & n_human(x1) & card_eq_2(x1))