A tan dog runs through the brush.
A dog is chasing a squirrel through some bushes.
The dog isn't necessarily chasing a squirrel.
exists e1 s1 x1 x2.(n_brush(x2) & through(e1,x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1) & a_tan(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(through(e1,x3) & n_bush(x3) & Theme(e1,x2) & Actor(e1,x1) & v_chase(e1) & n_squirrel(x2) & n_dog(x1))