A boy on a scooter.
The boy is outside.
Just because on a scooter does not mean he is outside.
exists x1 x2.(a_topic(x1) & on(x1,x2) & n_scooter(x2) & n_boy(x1))
exists s1 x1.(n_boy(x1) & Theme(s1,x1) & a_outside(s1))