A csengő hasonló a régihez.

Because the two as are two separate definite articles, both meaning the.

• A csengő = the bell / the doorbell / the buzzer
• a régihez = to the old one

In Hungarian, the definite article stays separate from the noun or adjective phrase. The case ending goes on the noun/adjective, not on the article.

So:

• a csengő = the bell
• a régihez = to the old one

This is completely normal in Hungarian.

Csengő can mean several related things, depending on context:

• bell
• doorbell
• buzzer
• sometimes a school bell or similar ringing device

So the exact English word depends on the situation. In this sentence, the grammar does not tell you which one it is; only the context does.

Because hasonló usually takes the ending -hoz / -hez / -höz, which means something like to in English.

So:

• hasonló valamihez = similar to something

That means:

• a régihez = to the old one

If you said only régi, that would just mean old or old one, but it would not show the to relationship required by hasonló.

That is simply the pattern this adjective uses in Hungarian.

Many Hungarian words require a particular case after them, just as English words often require a particular preposition. For example:

• English: similar to something
• Hungarian: hasonló
  • -hoz/-hez/-höz

Examples:

• Hasonló az enyémhez. = It is similar to mine.
• Hasonló a régihez. = It is similar to the old one.

So you can think of -hoz/-hez/-höz here as the Hungarian equivalent of English to after similar.

Literally, it means to the old one.

Here, régi normally means old, but Hungarian often allows an adjective to stand by itself when the noun is understood from context.

So instead of saying something like:

• a régi csengőhöz = to the old bell

Hungarian can shorten it to:

• a régihez = to the old one

English does this too:

• the old one
• the red one

So régi is functioning like old one here.

It is made of:

• régi = old
• -hez = the case ending used here, meaning roughly to

So:

• régi + hez = régihez

The ending appears as -hoz, -hez, or -höz depending on vowel harmony and sound pattern.

For example:

• házhoz = to the house
• kerthez = to the garden
• székhez = to the chair
• földhöz = to the earth/ground

In this sentence, -hez is the correct form.

Not necessarily. Hungarian often leaves out a noun if it is obvious from context.

So:

• a régi = the old one
• a nagy = the big one
• a piros = the red one

In your sentence, a régihez means to the old one, where one is understood. If the context is about bells or doorbells, the omitted noun is understood automatically.

Yes, often it could.

For example:

• A csengő hasonló a régihez.
• A csengő olyan, mint a régi.

Both can express a similar idea.

A rough difference:

• hasonló a régihez = similar to the old one
• olyan, mint a régi = like the old one / the same kind as the old one

In many everyday contexts, both are natural, but hasonló is a bit more directly equivalent to English similar.

The basic structure is:

• A csengő = subject
• hasonló = predicate adjective
• a régihez = complement of hasonló

So the sentence is:

• The bell is similar to the old one.

This is a neutral, natural word order in Hungarian.

Yes. Hungarian word order is flexible, and changing it can shift the emphasis.

For example:

• A csengő hasonló a régihez. = neutral
• A régihez hasonló a csengő. = puts more focus on to the old one
• Hasonló a csengő a régihez. = possible in the right context, but less neutral

The original version is the safest and most standard one for a learner.

A rough English-friendly guide:

• A = short aw
• csengő ≈ chen-goe
• hasonló ≈ haw-shon-loh
• a = short aw
• régihez ≈ ray-gee-hez

A few useful notes:

• cs is pronounced like English ch
• s is pronounced like English sh
• sz would be English s, but there is no sz in this sentence
• ő is a long rounded vowel, not exactly like a normal English vowel
• stress is always on the first syllable of each Hungarian word:
  • CSEN-gő
  • HA-son-ló
  • RÉ-gi-hez

Hungarian has two forms of the definite article:

• a
• az

Use:

• a before consonant sounds
• az before vowel sounds

So:

• a csengő because csengő begins with a consonant sound
• a régihez because régihez also begins with a consonant sound

Compare:

• az ajtó = the door
• az ember = the person

It is an adjective.

In this sentence, Hungarian uses an adjective as the predicate, just like English does in:

• The bell is similar to the old one.

Hungarian present-tense third-person sentences often omit the verb to be when the predicate is a noun or adjective.

So although English says:

• The bell is similar...

Hungarian simply says:

• A csengő hasonló...

There is no written is here, but the meaning is still is similar.