A man skateboarding on the side of steps
A man learns how to skateboard.
Just because one is skateboarding it does not mean that they are learning how to skateboard.
exists e1 x1 x2 x3 x4.(n_side(x3) & a_topic(x1) & on(e1,x3) & of(x3,x4) & n_step(x4) & Actor(e1,x2) & v_skateboard(e1) & (x1 = x2) & n_man(x1))
exists e1 x1 x2.(Topic(e1,x2) & Actor(e1,x1) & v_learn(e1) & n_manner(x2) & exists e2 x3.(Actor(e2,x3) & v_skateboard(e2)) & n_man(x1))