A gray dog is yawning.
A dog is tired.
dog is yawning just means dog is tired
exists e1 s1 x1.(Actor(e1,x1) & v_yawn(e1) & n_dog(x1) & a_gray(s1) & Theme(s1,x1))
exists s1 x1.(Theme(s1,x1) & a_tired(s1) & n_dog(x1))