A black Labrador retriever in a grassy field returns with a white nubby cylinder in its mouth.
A black lab fetches a bone thrown by his owner
Just because a dog brings a nubbly white cylinder from its forays does not mean that the object is a bone or thrown by its master.
exists s1 s2 s3 s4 x1 x2 x3 x4 x5 x6.(a_topic(x1) & in(x1,x3) & with(x3,x5) & in(x5,x6) & n_mouth(x6) & of(x6,x1) & n_thing(x1) & n_cylinder(x5) & a_nubby(s4) & Theme(s4,x5) & a_white(s3) & Theme(s3,x5) & n_return(x3) & of(x3,x4) & n_field(x4) & a_grassy(s2) & Theme(s2,x3) & n_retriever(x1) & of(x1,x2) & n_labrador(x2) & a_black(s1) & Theme(s1,x1))
exists e1 e2 s1 x1 x2 x3 x4.(Theme(e2,x2) & Actor(e2,x1) & v_fetch(e2) & Actor(e1,x4) & n_owner(x4) & of(x4,x1) & n_male(x1) & Theme(e1,x3) & v_throw(e1) & (x2 = x3) & n_bone(x2) & n_lab(x1) & a_black(s1) & Theme(s1,x1))