1A: How's your middle school, Jimin?

2B: It's good. Everyone is friendly.
3A: Is it different from elementary school?
4B: Yes, we have a big library. The school lunch is great, too.
-------------------------------------------------------------------------------
Q1: Does 'It' in 2B refer to 'your middle school'? Does 'it' in 3A refer to the same?
Q2: Why is 'The school lunch' used in 4B? Can't we use 'School lunch' here?
What is the difference between 'The school lunch' and 'School lunch'?

Q1 -- Yes, in both sentences.

Q2 -- The word "The" in 4B is just a natural phrasing. If you omit it, the sentence would sound strange. You could also say "The school lunches..." since there's a different lunch served each day.

Thank you for your help.

5. The school lunch is great.
6. The school lunch at the school cafeteria is great.
[Is the school lunch is the specific lunch at the school cafeteria? Does #5 mean #6?]

7. School lunch is great.
[Is 'School lunch' in generic use? General school lunch in any school?]

I wouldn't omit "the" when referring to school lunches. If I were to refer to a particular lunch served one day, I'd say, "The spaghetti lunch at school today was awful!" (or some variation!).

A1: Yes, in this conversation, 'It' in 2B refers to 'your middle school.' It means that Jimin's middle school is good and everyone there is friendly. And yes, 'it' in 3A also refers to the same thing, which is Jimin's middle school.

To determine this, we need to look at the context of the conversation. The conversation starts with 1A asking about Jimin's middle school, and then 2B replies with "It's good." Since the topic of discussion is Jimin's middle school, we can infer that 'It' refers back to the middle school mentioned in the previous question.

A2: In 4B, 'The school lunch' is used to specifically refer to the lunch provided by Jimin's middle school. It implies that the school has a particular lunch service or program that sets it apart from other schools. By using 'The school lunch,' it adds emphasis and highlights the quality or uniqueness of the lunch offered.

On the other hand, 'School lunch' is a more general term that refers to any kind of lunch provided by a school. It does not specify the school or highlight any particular qualities or attributes of the lunch.

So, the difference between 'The school lunch' and 'School lunch' lies in the specificity and emphasis. 'The school lunch' is more specific and implies uniqueness or distinction, while 'School lunch' is a broader and more general term.