A young child rides a motorbike through the mud.
There is a young child racing in a motorbike competition.
Any young child riding a motorbike need not be in a competition.
exists e1 s1 x1 x2 x3.(n_mud(x3) & through(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_motorbike(x2) & n_child(x1) & a_young(s1) & Theme(s1,x1))
exists p1 x1 s1 s2 x2 x3 x4.((x1 = x2) & in(x2,x4) & n_competition(x4) & a_motorbike(s2) & Theme(s2,x4) & n_racing(x2) & of(x2,x3) & n_child(x3) & a_young(s1) & Theme(s1,x2))