A bearded man in a white t-shirt is riding a motorcycle.
A man is riding a motorcycle on a dirt road.
riding a motorcycle in a white t-shirt doesn't imply you're on a dirt road.
exists e1 s1 s2 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_ride(e1) & n_motorcycle(x3) & in(x1,x2) & n_t-shirt(x2) & a_white(s2) & Theme(s2,x2) & n_man(x1) & a_bearded(s1) & Theme(s1,x1))
exists e1 x1 x2 x3 x4.(on(e1,x3) & n_road(x3) & of(x3,x4) & n_dirt(x4) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_motorcycle(x2) & n_man(x1))