A furry dog is walking by green trees while carrying something in its mouth.
The dog is carrying a large stick.
The something could be anything, not just a large stick.
exists e1 e2 s1 s2 x1 x2 x3 x4.(while(e1,e2) & Theme(e2,x3) & Actor(e2,x1) & v_carry(e2) & in(x3,x4) & n_mouth(x4) & of(x4,x1) & n_thing(x1) & n_thing(x3) & by(e1,x2) & n_tree(x2) & a_green(s2) & Theme(s2,x2) & Actor(e1,x1) & v_walk(e1) & n_dog(x1) & a_furry(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(n_dog(x1) & Theme(e1,x2) & Actor(e1,x1) & v_carry(e1) & n_stick(x2) & a_large(s1) & Theme(s1,x2))