A large tan dog sits on a grassy hill.
The dog is scratching itself because of fleas.
A dog may sit without scratching itself, and it may not necessarily have fleas.
exists e1 s1 s2 s3 x1 x2.(on(e1,x2) & n_hill(x2) & a_grassy(s3) & Theme(s3,x2) & Actor(e1,x1) & v_sit(e1) & n_dog(x1) & a_tan(s2) & Theme(s2,x1) & a_large(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_dog(x1) & of(e1,x2) & n_flea(x2) & r_because(e1) & Theme(e1,x2) & Actor(e1,x1) & v_scratch(e1) & n_thing(x2))