A person paddles a boat on a lake.
A person is riding a bike.
Paddles are not used for riding a bike and a bike is different from a boat.
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_paddle(e1) & on(x2,x3) & n_lake(x3) & n_boat(x2) & n_person(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_bike(x2) & n_person(x1))