The dog retrieves the branch from the water.
The dog has rollerskates
The dog retrieved a branch, not rollerskates
exists e1 x1 x2 x3.(n_water(x3) & n_branch(x2) & n_dog(x1) & from(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_retrieve(e1))
exists e1 x1 x2.(n_dog(x1) & Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_rollerskate(x2))