Fel kell fújni ezt a gumiabroncsot.

A useful breakdown is:

• fel = up, but here it is a verbal prefix
• kell = must / need to / it is necessary
• fújni = to blow
• ezt = this in the accusative
• a = the
• gumiabroncsot = tire in the accusative

So very literally, it is something like:

• up must blow this the tire

But natural English is This tire needs to be inflated or We/you need to inflate this tire, depending on context.

Yes, the dictionary form is felfújni or felfúj.

In Hungarian, many verbs have a verbal prefix, and that prefix does not always stay attached to the infinitive or verb form in the sentence. With kell + infinitive, the prefix often moves in front of kell:

• felfújni = to inflate
• fel kell fújni = must inflate / needs to be inflated

This is a very common pattern:

• megcsinálni → meg kell csinálni
• bevinni → be kell vinni

So fel still belongs semantically with fújni, but its position is affected by the sentence structure.

Kell expresses necessity, obligation, or need.

In this sentence, it means something like:

• must
• have to
• need to
• it is necessary to

Hungarian often uses kell + infinitive where English might use either an active construction or a passive-like one.

So:

• Fel kell fújni ezt a gumiabroncsot can feel like This tire needs to be inflated
• but literally the structure is more like It is necessary to inflate this tire

Because after kell, Hungarian normally uses the infinitive.

This works a lot like English modal-style meanings:

• kell menni = must go
• kell várni = must wait
• kell fújni = must blow
• fel kell fújni = must inflate

So fújni is not conjugated here because kell is the finite verb of the clause.

Yes, but Hungarian normally uses a demonstrative together with the definite article:

• ez a könyv = this book
• az a ház = that house

So the pattern is:

• ez/az + a/az + noun

When the noun changes case, the demonstrative usually changes too:

• ezt a könyvet = this book as a direct object
• ezt a gumiabroncsot = this tire as a direct object

So ezt a gumiabroncsot is the normal Hungarian way to say this tire in object position.

Because in Hungarian, the demonstrative often agrees in case with the noun.

Here the whole phrase is the direct object of fújni, so it takes the accusative.

• ez → ezt
• gumiabroncs → gumiabroncsot

The -t is the accusative marker. In gumiabroncsot, there is also a linking vowel -o- before the -t, because Hungarian often inserts a vowel when the noun would otherwise end in a difficult consonant cluster.

So:

• gumiabroncs = tire
• gumiabroncsot = tire as a direct object

It is correct, but it sounds a bit more formal or technical than what many people would say in casual speech.

Common possibilities are:

• gumiabroncs = precise, formal, technical
• gumi = very common everyday shorthand for tire
• kerék = wheel, sometimes used loosely in context, but not literally the same as tire

So in conversation, many Hungarians might say something like:

• Fel kell fújni ezt a gumit.

That means essentially the same thing in everyday speech.

No, not explicitly.

The sentence only states that the action is necessary. It is somewhat impersonal, like:

• It is necessary to inflate this tire
• This tire needs to be inflated

If you want to say who has to do it, Hungarian can express that too. For example:

• Fel kell fújnom ezt a gumiabroncsot. = I have to inflate this tire.
• Fel kell fújnod ezt a gumiabroncsot. = You have to inflate this tire.

So the original sentence leaves the responsible person unspecified.

You would say:

• Fel kell fújnom ezt a gumiabroncsot.

Here fújnom is an infinitive with a personal ending that shows the subject is I.

Some common forms are:

• fújnom = for me to blow / I have to blow
• fújnod = you have to blow
• fújnia = he/she has to blow

So Hungarian can keep kell + infinitive, but the infinitive itself can show the person.

The given order is a very natural neutral one:

• Fel kell fújni ezt a gumiabroncsot.

But Hungarian word order is flexible and often reflects topic and emphasis.

For example:

• Ezt a gumiabroncsot fel kell fújni.

This puts more attention on this tire.

So the sentence can change order, but the choice is usually about information structure, not just free variation. The version you were given is a standard, natural way to say it.

Historically and literally, yes, fel means up. But in many verbs, prefixes like fel- develop more abstract meanings.

With fúj, the combination felfúj means inflate / blow up. So here fel does not need to be translated separately as up in normal English. It is just part of the meaning of the whole verb.

Compare:

• fúj = blow
• felfúj = inflate / blow up

So it is best to learn felfúj as a single vocabulary item, even though it can split apart in actual sentences.