A person canoeing on water with a black background.
the person is driving a cab
If driving, the person is going to be on land not water.  Also can't drive and canoe at the same time.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x3) & with(x3,x4) & n_background(x4) & a_black(s1) & Theme(s1,x4) & n_water(x3) & Actor(e1,x2) & v_canoe(e1) & (x1 = x2) & n_person(x1))
exists e1 x1 x2.(n_person(x1) & Theme(e1,x2) & Actor(e1,x1) & v_drive(e1) & n_cab(x2))