A sailor steers a sailboat through a turn.
A sailor steers a sailboat through a turn on a rough sea.
Steers through a turn does not imply rough seas.
exists e1 x1 x2 x3.(through(e1,x3) & n_turn(x3) & Theme(e1,x2) & Actor(e1,x1) & v_steer(e1) & n_sailboat(x2) & n_sailor(x1))
exists e1 s1 x1 x2 x3 x4.(through(e1,x3) & on(x3,x4) & n_sea(x4) & a_rough(s1) & Theme(s1,x4) & n_turn(x3) & Theme(e1,x2) & Actor(e1,x1) & v_steer(e1) & n_sailboat(x2) & n_sailor(x1))