المساحة الخضراء في الحي.

Not usually. It is most naturally a noun phrase, meaning something like the green area in the neighborhood or the green space in the district.

A full sentence in Arabic would usually need something more, such as:

• المساحة الخضراء في الحي جميلة.
  The green area in the neighborhood is beautiful.

By itself, المساحة الخضراء في الحي can still appear naturally as:

• a heading
• a label
• a caption
• a short answer to a question

In Arabic, adjectives normally come after the noun they describe.

So:

• المساحة = the area / the space
• الخضراء = the green

Together:

• المساحة الخضراء = the green area

This is the normal Arabic word order for noun + adjective.

Because Arabic adjectives agree with the noun in definiteness as well as gender and number.

Here, المساحة is definite because it has الـ:

• المساحة = the area

So the adjective must also be definite:

• الخضراء = the green

That gives:

• المساحة الخضراء = the green area

Compare:

• مساحة خضراء = a green area
• المساحة الخضراء = the green area

So if the noun is definite, the adjective is definite too.

Because المساحة is a feminine singular noun, and the adjective must match it.

Arabic adjectives agree with the noun in:

• gender
• number
• definiteness
• case

So:

• المساحة = feminine singular
• therefore الخضراء must also be feminine singular

The masculine form would be الأخضر.

For example:

• المكان الأخضر = the green place
• المساحة الخضراء = the green area

Because الأخضر is the masculine form of green, while الخضراء is the feminine form.

This adjective is a good example of a common color pattern in Arabic:

• masculine: أخضر
• feminine: خضراء

Since المساحة is feminine, Arabic uses the feminine adjective:

• المساحة الخضراء

So this is not just a vocabulary choice; it is required by agreement.

في الحي is a prepositional phrase meaning in the neighborhood or in the district.

• في = in
• الحي = the neighborhood / the district

This phrase tells you where the green area is.

So the structure is:

• المساحة الخضراء = the green area
• في الحي = in the neighborhood

Together:

• المساحة الخضراء في الحي = the green area in the neighborhood

Yes. After a preposition like في, the noun is in the genitive case.

So in fully vowelled Arabic, you would read:

• فِي الحَيِّ

The last sound is a kasra sound, so roughly:

• fī al-ḥayyi

In normal everyday writing, short vowels are usually omitted, so you just see:

• في الحي

But grammatically, the noun is genitive because it comes after في.

It is pronounced roughly as al-ḥayy when paused, or al-ḥayyi in fully inflected reading after في.

A few useful points:

• ح is a deep, breathy h sound, not the ordinary English h
• the ي is effectively doubled here, giving -ayy
• with full case ending after في, it becomes -ayyi

So:

• in careful reading: fī al-ḥayyi
• in pause or simplified pronunciation: al-ḥayy

They are related in writing, but context tells you which meaning is intended.

• حَيّ can mean alive
• حَيّ can also mean quarter, district, or neighborhood

In this phrase, because it comes after في and fits the meaning of location, it clearly means:

• the neighborhood
• the district

So في الحي means in the neighborhood, not in the alive or anything similar.

Yes, but it would mean something slightly different depending on the wording.

The phrase given uses:

• في الحي = in the neighborhood

This emphasizes location:

• the green area that is located in the neighborhood

An iḍāfa-type idea such as مساحة الحي would mean something more like:

• the neighborhood’s area
• the area of the neighborhood

So في الحي is the better choice when you want to say in the neighborhood.

It breaks down like this:

1. المساحة — noun
2. الخضراء — adjective describing the noun
3. في الحي — prepositional phrase giving location

So the structure is:

definite noun + definite adjective + prepositional phrase

More explicitly:

• المساحة = the area
• الخضراء = green
• في الحي = in the neighborhood

That gives:

• the green area in the neighborhood

This is a very common Arabic pattern and a useful one to recognize.