How does the dual narrative help to arouse your sympathy for Victor and the creature in "Frankenstein"?(You've heard Victor's side of the story for...

The dual narrative is very effective because, first we get to know Victor's feelings very intimately. The reader understands how Victor is driven to create the monster, how he feels after the monster kills.

When the creature begins to narrate his humanity is revealed, he is sensitive, and almost innocent in his curiosity.  You can't help but feel sorry for the creature, he did not ask to be born, he is alone, abandoned, lonely and can't help his responses to certain situations.

For me, hearing from the creature helps to create sympathy for both Victor and the creature.  For Victor for his misguided use of science and for the result of his efforts, the creature.