A dog runs through the grass.
A dog being playful on a sunny day.
A dog can run in any number of ways, not necessarily in a playful way.  The grass mentioned does not imply the weather.
exists e1 x1 x2.(n_grass(x2) & through(e1,x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1))
exists s1 s2 x1 x2 x3.(a_topic(x1) & on(s1,x3) & n_day(x3) & a_sunny(s2) & Theme(s2,x3) & Theme(s1,x2) & a_playful(s1) & (x1 = x2) & n_dog(x1))