A man riding a bicycle down the street.
The man is on a boat.
The man cannot be on both a boat and a street while on a bicycle.
exists e1 x1 x2 x3 x4.(n_street(x4) & a_topic(x1) & down(x1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_bicycle(x3) & (x1 = x2) & n_man(x1))
exists p1 x1.(n_man(x1) & exists x2.(on(x1,x2) & n_boat(x2)))