A person riding a dirt bike.
A person rides a tricycle
Riding bike is different from  tricycle, bike is having two wheels and tricycle is having three wheels
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_bike(x3) & of(x3,x4) & n_dirt(x4) & (x1 = x2) & n_person(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_tricycle(x2) & n_person(x1))