A man in a leather jacket grins with his teeth showing.
The biker grins.
Not all men wearing leather jackets is a biker.
exists e1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & in(x1,x2) & with(x2,x5) & Actor(e1,x6) & v_show(e1) & (x5 = x6) & n_tooth(x5) & of(x5,x1) & n_male(x1) & n_grin(x2) & of(x2,x4) & n_jacket(x4) & of(x2,x3) & n_leather(x3) & n_man(x1))
exists x1 x2.(n_grin(x1) & of(x1,x2) & n_biker(x2) & a_topic(x1))