Gyertyatartót párosával veszek.

Because it is the direct object of the verb veszek (I buy).

In Hungarian, direct objects usually take the accusative ending -t:

• gyertyatartó = candle holder
• gyertyatartót = candle holder + accusative

So the sentence is literally structured like:

• gyertyatartót = candle holder(s) as the thing being bought
• párosával = in pairs
• veszek = I buy

Gyertyatartót is singular accusative.

But Hungarian often uses a singular bare noun in places where English prefers a plural. Here the sentence is talking about the kind of thing being bought, not counting them one by one in the grammar.

So:

• Gyertyatartót párosával veszek. = I buy candle holders in pairs.

Even though Hungarian uses the singular form, the meaning can still be naturally plural in English because párosával already tells us they are bought two at a time / in pairs.

Párosával means in pairs, by twos, or two at a time.

It describes how the buying happens: the candle holders are bought in groups of two.

So the sentence does not mean merely together in a vague sense. It specifically suggests pairing.

A natural English sense is:

• I buy candle holders in pairs.

Because Hungarian has two verb conjugations here:

• indefinite conjugation → used when the object is non-specific / indefinite
• definite conjugation → used when the object is specific / definite

In this sentence:

• Gyertyatartót párosával veszek.

the object is not specific. It means something like I buy candle holders in general, not the candle holders.

So the verb is:

• veszek = I buy (indefinite)

If the object were definite, you would use veszem:

• A gyertyatartókat párosával veszem. = I buy the candle holders in pairs.

Because the sentence is making a general / indefinite statement.

Hungarian often leaves out the article when talking about something in a broad, non-specific way:

• Gyertyatartót veszek. = I’m buying candle holder(s).

This is different from:

• A gyertyatartót veszem. = I’m buying the candle holder.

So in your sentence, no article helps show that the speaker is not talking about one specific known candle holder, but about candle holders as the type of thing they buy.

Hungarian word order is quite flexible, and it often shows topic and emphasis rather than just subject-verb-object order.

Here:

• Gyertyatartót is the topic/background: as for candle holders...
• párosával is placed right before the verb, which often gives it extra emphasis
• veszek = I buy

So the sentence can feel a bit like:

• As for candle holders, I buy them in pairs.
• or It’s in pairs that I buy candle holders.

The important highlighted idea is párosával.

Yes, you could, and it is grammatical.

• Gyertyatartót párosával veszek = slightly more generic, type-of-thing feeling
• Gyertyatartókat párosával veszek = more explicitly plural, focusing more on multiple individual items

In many contexts, both could translate naturally as:

• I buy candle holders in pairs.

So the original sentence is not wrong or strange; it is just using a very normal Hungarian way of speaking.

It is a compound word:

• gyertya = candle
• tartó = holder, stand, thing that holds something

So:

• gyertyatartó = candle holder

Then the accusative ending is added:

• gyertyatartó → gyertyatartót

This kind of compound is very common in Hungarian.

No, but Hungarian does not need one here, because the verb already shows the subject.

• veszek = I buy

The ending -ek tells you the subject is I.

So Hungarian can simply say:

• Gyertyatartót párosával veszek.

without a separate word for I.

If you added én, it would usually sound more emphatic:

• Én gyertyatartót párosával veszek. = I buy candle holders in pairs.