1a. First person.
1b. The narrator is the character of the story.
2a. Third person limited.
2b. It was describing what Harry was seeing and feeling, and only his perspectives.
3a. First person.
3b. They have a dialect.
3c. If it was written from third person limited, it would only describe how the character feels.
4a. They were both odd people. The wife has an uncertain temper and her only goal is to get her daughter married, while Mr. Bennet struggles to make his wife understand his character.
4b. Somehow yes, because in first person, you’d describe yourselves then the other characters.
5a. First person.
5b. They are on an expedition and they started late.
5c. “This expedition began this morning almost an hour later than I had planned.”