Az alapterület nagy.

Az is the definite article, meaning the.

Hungarian has two forms of the definite article:

• a before a consonant
• az before a vowel

Because alapterület begins with a vowel (a), Hungarian uses az:

• az alapterület
• but a ház = the house

So az here is not a separate word with a special meaning beyond the.

In Hungarian, the verb to be is usually left out in the present tense, third person singular and plural.

So where English says:

• The floor area is large

Hungarian simply says:

• Az alapterület nagy

This is completely normal Hungarian grammar.

But in other persons, the verb appears:

• Nagy vagyok = I am big
• Nagy vagy = you are big
• Nagyok vagyunk = we are big

And in the past tense, it also appears:

• Az alapterület nagy volt = The floor area was large

Here nagy is not directly modifying the noun inside a noun phrase. It is the predicate adjective: it tells us something about the subject.

So the structure is:

• Az alapterület = the subject
• nagy = the predicate adjective, meaning large

This is similar to English The floor area is large, where large also comes after the subject and after is.

If the adjective were directly attached to the noun, Hungarian would put it before the noun:

• a nagy alapterület = the large floor area

So compare:

• Az alapterület nagy. = The floor area is large.
• A nagy alapterület... = The large floor area...

Alapterület is a compound noun.

It is made from:

• alap = base, foundation, basic
• terület = area, territory, surface

Together, alapterület means something like floor area, ground area, or usable area, depending on context.

Hungarian makes a lot of compound nouns, and this is a very common pattern.

No. In this sentence, nagy stays the same.

Hungarian adjectives do not agree with the noun in gender, because Hungarian has no grammatical gender. They also do not change here for singular/plural in this predicate use.

So:

• Az alapterület nagy. = The floor area is large.
• Az alapterületek nagyok. = The floor areas are large.

Notice that in the plural sentence, the adjective becomes nagyok because it is used predicatively with a plural subject. But there is still no gender agreement.

This is purely a sound-based rule.

Hungarian uses:

• a before words beginning with a consonant
• az before words beginning with a vowel

Since alapterület starts with a, the correct form is:

• az alapterület

This is similar to English a / an:

• a house
• an apple

So you can think of a / az as working in a somewhat similar way.

Yes. Nagy az alapterület is also grammatical.

The basic neutral sentence is:

• Az alapterület nagy.

If you say:

• Nagy az alapterület.

you are often giving a bit more emphasis to nagy — as if highlighting It is large or The floor area is large in contrast to something else.

Hungarian word order is flexible, and changing the order often changes focus or emphasis, not just grammar.

Because it is the subject of the sentence, and subjects in Hungarian are normally in the nominative, which usually has no ending.

So the bare form alapterület is the normal dictionary form and also the subject form.

If it had a different role, it could take a case ending. For example:

• alapterületet = accusative
• alapterületben = in the floor area
• alapterületre = onto the floor area

But in Az alapterület nagy, it is just the subject, so no extra ending is needed.

A rough pronunciation guide is:

• az ≈ ahz
• alapterület ≈ aw-lahp-teh-rew-let
• nagy ≈ roughly nody or nawdj, depending on how you approximate Hungarian sounds

A few important points:

• Stress in Hungarian is always on the first syllable: ALapterület
• ü is a front rounded vowel, which English does not really have
• gy is a single consonant sound, softer than English g

So the sentence is stressed roughly like:

• AZ ALapterület NAGY

Not only. Nagy is a very common adjective meaning big, large, or sometimes great, depending on context.

Examples:

• nagy ház = big house
• nagy város = big city
• nagy probléma = big problem
• nagy ember = a great / important person, depending on context

In Az alapterület nagy, it most naturally means large in the sense of area or size.

Usually not if you mean the floor area in a specific, known sense.

• az alapterület = the floor area
• egy alapterület = a floor area

In many contexts, egy alapterület sounds less natural unless you are talking about one floor area among several, or introducing it as new information.

So for a normal statement like The floor area is large, az is the natural choice.