A young boy is playing around on a tram.
A youngster learns to drive a tram.
We don't know that he learns to drive while playing on it, only that he's playing on it.
exists e1 s1 s2 x1 x2.(on(e1,x2) & n_tram(x2) & a_around(s2) & Manner(e1,s2) & Actor(e1,x1) & v_play(e1) & n_boy(x1) & a_young(s1) & Theme(s1,x1))
exists e1 p1 x1.(Topic(e1,p1) & Actor(e1,x1) & v_learn(e1) & exists e2 x2.(Theme(e2,x2) & Actor(e2,x1) & v_drive(e2) & n_tram(x2)) & n_youngster(x1))