A lánc már nagyon rozsdás.

In Hungarian, the verb to be is usually left out in the present tense, third person when the predicate is an adjective or noun.

So Hungarian says:

A lánc már nagyon rozsdás.

where English needs:

The chain is already very rusty.

This is completely normal in Hungarian.

Compare:

• A lánc rozsdás. = The chain is rusty.
• A lánc rozsdás volt. = The chain was rusty.
• A lánc rozsdás lesz. = The chain will be rusty.

In the past and future, the verb appears, but in the present tense here, it is omitted.

A is the definite article, so it means the.

Hungarian has two forms of the definite article:

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

So:

• a lánc = the chain
• az alma = the apple

Here lánc begins with a consonant sound, so a is the correct form.

The accent in Hungarian shows vowel length, not stress.

So a and á are different vowels:

• a = a short vowel
• á = a longer vowel

lánc is pronounced approximately like laants, with a long aa sound.

A few useful pronunciation points in this sentence:

• lánc: the final c sounds like ts
• már: long á
• rozsdás: also has long á

Hungarian spelling is quite regular, so the accents are important and should not be ignored.

Here már means already or by now.

It often shows that something has happened sooner than expected, or that a state has been reached.

So in this sentence, már suggests something like:

• the chain has reached the state of being very rusty
• it is already in that condition now

Depending on context, már can sometimes feel like:

• already
• by now
• now

But in this sentence, already is the most natural match.

Nagyon means very. It is an adverb modifying the adjective rozsdás.

So:

• rozsdás = rusty
• nagyon rozsdás = very rusty

It comes before the adjective, just as degree words usually do in Hungarian.

Other examples:

• nagyon jó = very good
• nagyon hideg = very cold
• nagyon régi = very old

So nagyon rozsdás is a normal and straightforward adjective phrase.

Rozsdás is an adjective meaning rusty.

It is related to the noun rozsda, which means rust. The ending -s often makes an adjective meaning something like having, full of, or characterized by something.

So roughly:

• rozsda = rust
• rozsdás = rusty, rust-covered, having rust

This is a common Hungarian pattern.

Hungarian word order is fairly flexible, but different orders can change the emphasis.

The given sentence,

A lánc már nagyon rozsdás.

is a natural, neutral way to say it.

It starts with the topic A lánc and then gives new information about it.

Other orders are possible, for example:

• Már nagyon rozsdás a lánc.
• A lánc nagyon rozsdás már.

These can sound a bit more marked or context-dependent. They are not necessarily wrong, but the original version is the safest neutral choice for a learner.

Yes, but only in a limited way.

Hungarian does not have grammatical gender, so there is no masculine/feminine/neuter agreement.

With a singular subject, you get:

• A lánc rozsdás. = The chain is rusty.

With a plural subject, the predicate adjective is usually plural too:

• A láncok rozsdásak. = The chains are rusty.

So in your sentence, rozsdás is singular because lánc is singular.

The important point for English speakers is:

• no gender agreement
• but plural subjects can trigger a plural predicate adjective

Because a means the, while egy means a/an.

So:

• a lánc = the chain
• egy lánc = a chain

Hungarian makes the same definite/indefinite distinction as English here.

If the sentence is about a specific chain that speaker and listener can identify, a lánc is right. If it were just any chain, you would use egy lánc.