A man Rollerblades in a park.
The man prefers rollerblades to skateboards.
A man Rollerblades in a park does not always prefers rollerblades to skateboards.
exists e1 x1 x2.(in(e1,x2) & n_park(x2) & Actor(e1,x1) & v_rollerblade(e1) & n_man(x1))
exists e1 x1 x2 x3.(n_man(x1) & to(e1,x3) & n_skateboard(x3) & Theme(e1,x2) & Actor(e1,x1) & v_prefer(e1) & n_rollerblade(x2))