The wheel of the bus is being held by a person in a black shirt.
a person rides the bus
Either the wheel of the bus us being held or a person rides the bus.
exists e1 s1 x1 x2 x3 x4.(n_bus(x2) & n_wheel(x1) & Actor(e1,x3) & in(x3,x4) & n_shirt(x4) & a_black(s1) & Theme(s1,x4) & n_person(x3) & Theme(e1,x1) & v_hold(e1) & of(x1,x2))
exists e1 x1 x2.(n_bus(x2) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_person(x1))