Elcseréljük a farmernadrágot.

Hungarian often leaves subject pronouns out when the verb ending already makes the subject clear.

In elcseréljük, the ending tells you the subject is we. So mi is not needed.

You could say Mi elcseréljük a farmernadrágot, but that would usually add emphasis, like we are the ones exchanging it.

Because Hungarian verbs have two kinds of conjugation:

• indefinite conjugation
• definite conjugation

Here the object is a farmernadrágot, which is definite: it means a specific pair of jeans. Because of that, the verb must also be in the definite form:

• elcseréljük = we exchange it / the specific item
• elcserélünk would be used with an indefinite object or no object

For example:

• Elcseréljük a farmernadrágot.
• Elcserélünk egy farmernadrágot.

The ending -jük is the 1st person plural definite ending.

In elcseréljük, -jük shows two things at once:

• the subject is we
• the verb has a definite object

So it is not just we exchange in a general sense; it is specifically we exchange it / the definite thing.

This is a very common feature of Hungarian grammar and one of the first big differences from English.

Because it is the direct object of the verb.

Hungarian marks direct objects with the accusative ending -t. In this word, a linking vowel appears too, so:

• farmernadrág → basic form
• farmernadrágot → direct object form

English usually does not mark direct objects on the noun itself, but Hungarian often does.

It is singular.

That can feel strange to an English speaker because English normally says jeans, which looks plural. But Hungarian commonly uses farmernadrág as a singular noun for one pair of jeans.

So:

• farmernadrágot = one pair of jeans, as the object
• farmernadrágokat = multiple pairs of jeans, as the object

Because the sentence is talking about a specific pair of jeans, not just any pair.

Hungarian has:

• a before a consonant
• az before a vowel

Since farmernadrágot starts with f, the article is a.

So a farmernadrágot means the jeans or that specific pair of jeans.

El- is a verbal prefix (often called a preverb).

With cserél, it gives the idea of exchanging away / swapping something, often with a sense of the action being carried through or completed.

Very roughly:

• cserél = exchange, change
• elcserél = swap away, exchange one thing for another

These prefixes are extremely important in Hungarian and often change the nuance of the verb.

Yes. In Hungarian, verbal prefixes often separate from the verb in certain sentence types.

In a neutral statement, it stays attached:

• Elcseréljük a farmernadrágot.

But with negation, for example, it usually moves:

• Nem cseréljük el a farmernadrágot.

It can also separate when another element is strongly focused.

So the joined form in your sentence is the normal pattern for a neutral affirmative sentence.

Yes, this is a very normal neutral word order.

Structure here is roughly:

• el-
  • verb
• object after the verb

So:

• Elcseréljük = we exchange it
• a farmernadrágot = the jeans

Hungarian word order is quite flexible, but changes in order usually affect focus, emphasis, or topic.

For example:

• A farmernadrágot cseréljük el.
  This puts more attention on the jeans.

Yes. It is a compound noun, and Hungarian commonly writes compounds as one word.

It is made from:

• farmer = denim / jeans-related
• nadrág = trousers / pants

So farmernadrág is literally something like jeans-trousers, meaning jeans.

Compounds like this are very common in Hungarian vocabulary.

Not exactly, though they can overlap in some contexts.

• elcserél usually suggests swapping one thing for another
• kicserél often suggests replacing something with something else, and is very common in shop or service situations

So the nuance can differ a bit:

• elcserélni = trade/swap
• kicserélni = exchange/replace

In everyday speech, context matters, and sometimes either can sound possible, but they are not perfectly identical.