A small boat being rowed down a river.
A car is towing a boat in a river.
A boat could not be towed if it is being rowed, that is not possible.
exists e1 s1 s2 x1 x2 x3.(a_topic(x1) & a_down(s2) & Manner(e1,s2) & Recipient(e1,x3) & Theme(e1,x2) & v_row(e1) & n_river(x3) & (x1 = x2) & n_boat(x1) & a_small(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_tow(e1) & in(x2,x3) & n_river(x3) & n_boat(x2) & n_car(x1))