a girl jumps on the trampoline.
The girl is a gymnast.
Jumping on a trampoline does not imply that the individual doing the jumping is a gymnast.
exists e1 x1 x2.(n_trampoline(x2) & on(e1,x2) & Actor(e1,x1) & v_jump(e1) & n_girl(x1))
exists p1 x1.(n_girl(x1) & exists x2.((x1 = x2) & n_gymnast(x2)))