Ineed figuring out the difference between who and whom and i dont understand the he or him trick

For instance, instead of saying "John has a dog", we could say "He has a dog"

We could either say "The dog belongs to John", or "The dog belongs to him". (Note that in this case, the dog is the subject, and John (he) is the object)

For instance, we could ask: "Who has a dog?", but we would say "I am not sure whom this dog belongs to."

answer:

a. "there, said he, there is something for you."

explanation:

"said he" should not have been part of what is in the dialogue.