A telefonfülke kicsi.

In Hungarian, the verb to be is usually left out in the present tense, third person singular when you are linking a subject to a noun or adjective.

So:

• A telefonfülke kicsi. = The phone booth is small.

But in other situations, van or another form of to be does appear:

• A telefonfülke kicsi volt. = The phone booth was small.
• Kicsi vagyok. = I am small.
• A telefonfülke itt van. = The phone booth is here.

So this sentence is completely normal without an explicit is.

A is the Hungarian definite article, meaning the.

Hungarian has two forms:

• a before a consonant sound
• az before a vowel sound

Since telefonfülke begins with t, a consonant, you use a:

• a telefonfülke

Compare:

• az asztal = the table

This choice has nothing to do with gender, because Hungarian nouns do not have grammatical gender.

Because it is a compound noun.

Hungarian very often combines two nouns into one word where English might use two words or a phrase. Here:

• telefon = telephone
• fülke = booth, cabin, cubicle

So telefonfülke literally means something like telephone booth.

This kind of compounding is extremely common in Hungarian.

Here kicsi is not directly modifying the noun inside a noun phrase. It is the predicate adjective: it tells you what the phone booth is like.

So:

• A telefonfülke kicsi. = The phone booth is small.

If you put the adjective before the noun, then it becomes part of the noun phrase:

• A kicsi telefonfülke = the small phone booth

So the position changes the structure:

• noun + adjective in this sentence = The phone booth is small
• adjective + noun = the small phone booth

Both kis and kicsi relate to small, but they are used a bit differently.

A very useful rule for learners is:

• kis is very common before a noun
• kicsi is the normal form when the adjective stands by itself as the predicate

So:

• A telefonfülke kicsi. = correct
• A kis telefonfülke = the small phone booth

You may also see kicsi before a noun, but in simple beginner usage, it is safest to think:

• kis = attributive, before a noun
• kicsi = predicative, after the noun in sentences like this

A rough English-friendly guide is:

• telefonfülke ≈ TE-le-fon-fül-ke
• kicsi ≈ KI-chi

A few important pronunciation points:

• ü is like German ü or French u: a front rounded vowel not found in standard English
• cs is pronounced like English ch
• stress in Hungarian normally falls on the first syllable of the word

So:

• telefonfülke → stress on te
• kicsi → stress on ki

No, because Hungarian has no grammatical gender.

There is no masculine, feminine, or neuter agreement like in many Indo-European languages. So kicsi does not change depending on whether the noun refers to a male, female, or object.

That makes things simpler:

• A fiú kicsi. = The boy is small.
• A lány kicsi. = The girl is small.
• A telefonfülke kicsi. = The phone booth is small.

The adjective form stays the same.

Yes. In a sentence like this, a predicate adjective normally becomes plural when the subject is plural.

So:

• A telefonfülke kicsi. = The phone booth is small.
• A telefonfülkék kicsik. = The phone booths are small.

Notice both changes:

• telefonfülke → telefonfülkék for plural noun
• kicsi → kicsik for plural predicate adjective

No. In this sentence, telefonfülke is in the basic dictionary form with no extra case ending.

That is because it is the subject of the sentence.

So:

• telefonfülke = base form
• no accusative, dative, or other case ending is needed here

This is one of the simplest possible Hungarian sentence patterns: article + subject + predicate adjective

Yes, Hungarian word order is flexible, but changing it usually changes the emphasis.

The neutral version is:

• A telefonfülke kicsi.

You could also say:

• Kicsi a telefonfülke.

That still means The phone booth is small, but now the focus is more on small.

So the sentence can be reordered, but the most basic, neutral form for a learner is the one you were given.

Usually, no—not in ordinary standard usage if you mean the phone booth.

With a singular count noun in a normal statement, Hungarian usually wants the article when the noun is definite:

• A telefonfülke kicsi.

Without the article, Telefonfülke kicsi sounds unnatural in most normal contexts, or very telegraphic.

Hungarian can omit articles in some special contexts, but for a basic sentence like this, keep a.