37. I don’t like pork. My sister doesn’t like pork, either. → I don’t like pork. Neither
38. I use a cassette to practice listening skills.
→A cassette
39. I’m very keen on joining the rock concert next Sunday.
→I’m looking
40. Mary’s mother said to her, “Bring your raincoat along when you leave home today.”
Mary’s mother asked
41. Lan said to Quan, “How often does your sister go to the zoo?”
Lan asked
42. Henry’s success is his parents’ pride.
Henry’s parents are

37. I don’t like pork. Neither does my sister.

38. A cassette is what I use to practice listening skills.

39. I’m looking forward to joining the rock concert next Sunday.

40. Mary’s mother asked her to bring her raincoat along when she leaves home today.

41. Lan asked Quan how often does his sister go to the zoo

42. Henry’s parents are proud of his success.

Explanation:

To answer this question one needs to have different grammar rules in mind.

For example, 'Neither do I' means the same as 'Me neither,' and it can also be used along with other subjects and auxiliary verbs for all personal pronouns using the following form:

NEITHER/NOR + Auxiliary + Subject

Such is the case with 'neither does my sister.'

3rd person, because the narrator is out of the story but explains the feeling of the main character