A little brown dog runs through the grass.
A small dog is playing on a grass
Little is a synonym for small.  A dog runs through the grass playing.
exists e1 s1 s2 x1 x2.(n_grass(x2) & through(e1,x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1) & a_brown(s2) & Theme(s2,x1) & a_little(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(on(e1,x2) & n_grass(x2) & Actor(e1,x1) & v_play(e1) & n_dog(x1) & a_small(s1) & Theme(s1,x1))