A watercraft speeds through the water.
The boat is really speeding on land.
A boat cannot be on land while it is in the water.
exists e1 x1 x2.(n_water(x2) & through(e1,x2) & Actor(e1,x1) & v_speed(e1) & n_watercraft(x1))
exists e1 s1 x1 x2.(n_boat(x1) & a_really(s1) & Manner(e1,s1) & on(e1,x2) & n_land(x2) & Actor(e1,x1) & v_speed(e1))