What is the definition of polyptoton

If a poet wants to tell an exciting story using a quick rhythmic pattern, what poetic form would best fit this function

In a short story the narrator's word choice

Which sentence is written correctly? oa. according to the weather forecast, it will be sunny all week. ob. do you know weather she will attend the show? oc. we should expect cloudy whether during the weekend. od. i like to stay at home and read a good book during rainy whether.