Smelly Slippers<br>Tom trained his dog to get his slippers for him. He would do it every single time. After a while he stopped doing it. Tom noticed his slippers smelled really bad. He got a new pair and his dog fetched them again.
John's dog fetched his old slippers after he bought new ones.
It only says that he started fetching the slippers again, never WHICH slippers the dog was fetching.
( z1 fetch :ARG0 ( z2 dog :poss ( z3 person :name ( z4 name :op "John" ) ) ) :ARG1 ( z5 slippers :mod ( z6 old ) :poss z3 ) :time ( z7 after :op ( z8 buy :ARG0 z3 :ARG1 ( z9 slippers :ARG1-of ( z10 new ) ) ) ) )