Greyhounds take a corner at a race.
The dogs are racing.
dogs are racing  implies that take a corner at a race.
exists e1 x1 x2 x3.(at(e1,x3) & n_race(x3) & Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & n_corner(x2) & n_greyhound(x1))
exists e1 x1.(n_dog(x1) & Actor(e1,x1) & v_race(e1))