मेरे घर और ऑफिस के बीच एक बड़ा बाज़ार है।

Because मेरे is being used before a noun phrase that is tied to a postposition later in the sentence.

In Hindi, nouns often change form when they come before postpositions such as में, से, के लिए, के बीच, etc. This is called the oblique case. Possessives often match that pattern too.

Here, the phrase is:

मेरे घर और ऑफिस के बीच = between my home and office

Since घर और ऑफिस is part of a phrase followed by के बीच, मेरा becomes मेरे.

Compare:

• मेरा घर बड़ा है। = My house is big.
• मेरे घर के पास एक पार्क है। = There is a park near my house.

So in your sentence, मेरे is the correct form.

In this sentence, मेरे घर और ऑफिस usually means my home and office in a natural, economical way.

Hindi often avoids repeating possessives when the meaning is clear. So:

• मेरे घर और ऑफिस के बीच
  usually means between my home and office

If you want to be extra explicit, you could also say:

• मेरे घर और मेरे ऑफिस के बीच

That is also correct, but slightly more repetitive.

So both are possible:

• मेरे घर और ऑफिस के बीच = natural, common
• मेरे घर और मेरे ऑफिस के बीच = more explicit

के बीच means between.

So:

• घर और ऑफिस के बीच = between the house and the office

Hindi often expresses spatial relations with postpositions rather than prepositions. English says between X and Y, but Hindi says something like:

X and Y + के बीच

Examples:

• दो पेड़ों के बीच = between two trees
• दिल्ली और आगरा के बीच = between Delhi and Agra
• मेरे घर और ऑफिस के बीच = between my home and office

So के बीच is the normal Hindi way to say between.

Because के agrees with the noun phrase before it in this construction.

The phrase before बीच is:

घर और ऑफिस = house and office

This is a compound/plural-like idea because there are two things, so Hindi uses के.

Compare the possessive/postpositional agreement patterns:

• लड़के का = of the boy
• लड़की की = of the girl
• लड़कों के = of the boys
• घर और ऑफिस के बीच = between the house and the office

Since there are two nouns joined by और, के is the correct form.

Because बाज़ार is a masculine singular noun.

In Hindi, adjectives like बड़ा change form to match the noun they describe:

• बड़ा = masculine singular
• बड़ी = feminine singular
• बड़े = masculine plural / masculine oblique in some contexts

Here:

• बाज़ार = market, masculine singular
• so एक बड़ा बाज़ार = a big market

Compare:

• एक बड़ा बाज़ार = a big market
• एक बड़ी दुकान = a big shop
• बड़े बाज़ार = big markets / in some oblique contexts

Yes, बाज़ार is generally treated as a masculine noun in Hindi.

One clue is the adjective agreement in this sentence:

• बड़ा बाज़ार

If बाज़ार were feminine, it would be:

• बड़ी बाज़ार — which is incorrect

Unfortunately, noun gender in Hindi is not always predictable, so learners often need to memorize it. But seeing adjectives agree with the noun is a very helpful clue.

So from this sentence, you can learn:

• बाज़ार = masculine
• therefore: बड़ा बाज़ार

एक means one or a/an, depending on context.

Here:

• एक बड़ा बाज़ार है = there is a big market

In Hindi, एक is often used where English would use a/an, especially when introducing something as a single item.

It is not always absolutely necessary, but it sounds natural here. Compare:

• मेरे घर और ऑफिस के बीच एक बड़ा बाज़ार है।
  = There is a big market between my home and office.

• मेरे घर और ऑफिस के बीच बड़ा बाज़ार है।
  This sounds less natural in most contexts.

So एक is a very normal choice here.

Because Hindi usually follows SOV-style word order and often places the main verb at the end.

This sentence is structured like:

• मेरे घर और ऑफिस के बीच = between my home and office
• एक बड़ा बाज़ार = a big market
• है = is

So literally the order is closer to:

Between my home and office, a big market is.

That sounds strange in English, but it is normal in Hindi.

This final-position verb pattern is one of the most important differences between Hindi and English.

Yes. You may hear both:

• के बीच
• के बीच में

Both can mean between.

In many everyday contexts, के बीच is enough and sounds natural.
Adding में can give a slightly fuller or more emphatic expression, but often the meaning stays the same.

So these are both fine:

• मेरे घर और ऑफिस के बीच एक बड़ा बाज़ार है।
• मेरे घर और ऑफिस के बीच में एक बड़ा बाज़ार है।

The version without में is perfectly standard.

Good question. Some Hindi nouns visibly change in the oblique case, but some do not show a visible change.

घर is one of those nouns that often looks the same in direct and oblique singular.

So:

• मेरा घर = my house
• मेरे house? no, in Hindi: मेरे घर के पास = near my house

Even though घर is functioning in a postpositional phrase, its form stays घर.

Compare that with a noun that does visibly change:

• लड़का → लड़के
• लड़के के पास = near the boy

But:

• घर → घर
• घर के पास = near the house

So the oblique function is there, even if the noun itself does not visibly change.

Yes, ऑफिस is very common in modern Hindi. It is a borrowing from English and is widely used in speech and writing.

You could also use:

• दफ़्तर = office (very common)
• कार्यालय = office (more formal)

So these are all possible:

• मेरे घर और ऑफिस के बीच एक बड़ा बाज़ार है।
• मेरे घर और दफ़्तर के बीच एक बड़ा बाज़ार है।
• मेरे घर और कार्यालय के बीच एक बड़ा बाज़ार है।

The first one sounds modern and very natural in everyday speech.

This order is the most neutral and natural:

• मेरे घर और ऑफिस के बीच एक बड़ा बाज़ार है।

But Hindi word order is somewhat flexible, especially for emphasis. For example, you might hear:

• एक बड़ा बाज़ार मेरे घर और ऑफिस के बीच है।

This is still understandable, but the original sentence sounds more natural as a plain statement of location.

A useful pattern to remember is:

[place/location phrase] + [thing] + है

Examples:

• कमरे में एक मेज़ है। = There is a table in the room.
• घर के सामने एक पेड़ है। = There is a tree in front of the house.
• मेरे घर और ऑफिस के बीच एक बड़ा बाज़ार है। = There is a big market between my home and office.

A simple pronunciation guide is:

mere ghar aur office ke beech ek bada bazaar hai

A slightly more careful breakdown:

• मेरे = meh-ray
• घर = ghar (with a guttural gh, not like English g)
• और = aur
• ऑफिस = office
• के = kay
• बीच = beech
• एक = often ek
• बड़ा = buh-raa / ba-ṛā
  The ड़ is a retroflex flap sound.
• बाज़ार = baa-zaar
• है = usually hai

Natural rhythm:

मेरे घर और ऑफिस के बीच | एक बड़ा बाज़ार है।

You would change the noun and the verb, and usually the adjective too:

• मेरे घर और ऑफिस के बीच बड़े बाज़ार हैं।

Breakdown:

• बड़े = big (matching masculine plural बाज़ार)
• बाज़ार = markets
• हैं = are

So:

• एक बड़ा बाज़ार है। = There is a big market.
• बड़े बाज़ार हैं। = There are big markets.

If you want to keep some/a few feeling, context usually handles that, or you can add a word if needed.