A little boy rides a bike down a hill on a miniature dirt bike.
The boy is a teenager.
Not all little boy is a teenager.
exists e1 s1 x1 x2 x3 x4 x5 x6.(down(e1,x3) & on(x3,x4) & n_bike(x4) & of(x4,x6) & n_dirt(x6) & of(x4,x5) & n_miniature(x5) & n_hill(x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bike(x2) & n_boy(x1) & a_little(s1) & Theme(s1,x1))
exists p1 x1.(n_boy(x1) & exists x2.((x1 = x2) & n_teenager(x2)))