A dark brown dog runs behind a yellow dog in the grass.
The dogs are sleeping in the shade.
A dog runs cannot simultaneously be sleeping.
exists e1 s1 s2 s3 x1 x2 x3.(n_grass(x3) & behind(e1,x2) & in(x2,x3) & n_dog(x2) & a_yellow(s3) & Theme(s3,x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1) & a_brown(s2) & Theme(s2,x1) & a_dark(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_shade(x2) & n_dog(x1) & in(e1,x2) & Actor(e1,x1) & v_sleep(e1))