A white dog is playing with a plastic bag.
A brown cat is sleeping.
A dog is not a cat. If an animal is playing it is not also sleeping.
exists e1 s1 s2 x1 x2.(with(e1,x2) & n_bag(x2) & a_plastic(s2) & Theme(s2,x2) & Actor(e1,x1) & v_play(e1) & n_dog(x1) & a_white(s1) & Theme(s1,x1))
exists e1 s1 x1.(Actor(e1,x1) & v_sleep(e1) & n_cat(x1) & a_brown(s1) & Theme(s1,x1))