A red speed boat crosses the water.
A couple is on a red speed boat, enjoying the water.
Just because there is a speed boat that crosses the water, does not imply that a couple is on the speed boat. It also does not imply they are enjoying the water.
exists e1 s1 x1 x2 x3.(n_water(x3) & Theme(e1,x3) & Actor(e1,x1) & v_cross(e1) & n_boat(x1) & of(x1,x2) & n_speed(x2) & a_red(s1) & Theme(s1,x1))
exists e1 p1 x1 x2.(n_water(x2) & for(p1,e1) & Theme(e1,x2) & Actor(e1,x1) & v_enjoy(e1) & exists s1 x3 x4.(on(x1,x3) & n_boat(x3) & of(x3,x4) & n_speed(x4) & a_red(s1) & Theme(s1,x3)) & n_couple(x1))