A small child is riding on a toboggan.
A small child is tobogganing.
"A small child is tobogganing" is a rephrase of "A small child is riding on a toboggan".
exists e1 s1 x1 x2.(on(e1,x2) & n_toboggan(x2) & Actor(e1,x1) & v_ride(e1) & n_child(x1) & a_small(s1) & Theme(s1,x1))
exists e1 s1 x1.(Actor(e1,x1) & v_toboggan(e1) & n_child(x1) & a_small(s1) & Theme(s1,x1))