A black dog in a grassy field fetching a colourful toy.
A boy threw the frisbee.
A dog fetching a colorful toy does not imply a boy threw a frisbee.
exists e1 s1 s2 s3 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x4) & Actor(e1,x3) & v_fetch(e1) & n_toy(x4) & a_colourful(s3) & Theme(s3,x4) & (x1 = x3) & in(x1,x2) & n_field(x2) & a_grassy(s2) & Theme(s2,x2) & n_dog(x1) & a_black(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_frisbee(x2) & Theme(e1,x2) & Actor(e1,x1) & v_throw(e1) & n_boy(x1))