Az előjegyzés még érvényes.

In Hungarian, the verb van (to be) is usually left out in the present tense, third person when you are making a simple statement like this.

So:

• Az előjegyzés még érvényes. = The reservation/appointment is still valid.

But in other persons, Hungarian does use the verb:

• Érvényes vagyok = I am valid (unnatural in meaning, but grammatically shows the pattern)
• Érvényes vagy = you are valid
• Érvényes = he/she/it is valid

And in the past or future, van-type forms appear again:

• Az előjegyzés érvényes volt. = The reservation was valid.

So the missing is is completely normal here.

Hungarian has two forms of the definite article:

• a
• az

They both mean the.

Which one you use depends on the sound at the beginning of the next word:

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

Since előjegyzés begins with e/é, a vowel sound, you say:

• az előjegyzés

Compare:

• a foglalás = the reservation
• az előjegyzés = the appointment / the booking / the reservation

This is similar to a/an in English, except Hungarian does it with the definite article.

Előjegyzés can mean something like:

• appointment
• reservation
• booking
• advance registration
• scheduled entry

The best English translation depends on the context.

For example:

• at a doctor’s office, it may mean appointment
• in a library or service system, it may mean reservation
• in some official or administrative contexts, it can mean pre-registration

So if the sentence means The reservation is still valid, that is fine, but the Hungarian word may be a little broader than one single English word.

Here még means still.

So:

• Az előjegyzés érvényes. = The reservation is valid.
• Az előjegyzés még érvényes. = The reservation is still valid.

It adds the idea that the validity continues up to now.

A very common learner point:

• még often = still / yet / more, depending on context

In this sentence, still is the natural meaning.

Érvényes means:

• valid
• in force
• effective
• sometimes acceptable for use

In everyday language, it is often used for things like:

• jegy = ticket
  
  • A jegy érvényes. = The ticket is valid.
• igazolvány = ID card
  
  • Az igazolvány érvényes. = The ID is valid.
• előjegyzés = reservation/appointment
  
  • Az előjegyzés érvényes. = The reservation is valid.

So here it means that the booking/appointment has not expired, not been canceled, and can still be used.

This is a very normal, neutral Hungarian sentence order:

• Az előjegyzés = the topic, what the sentence is about
• még érvényes = what is being said about it

So the structure is roughly:

• As for the reservation, it is still valid.

Hungarian word order is flexible, but it often reflects topic and focus, not just grammar.

This version sounds neutral and natural.

You might also hear:

• Még érvényes az előjegyzés.

That can also be correct, but it feels a bit different in emphasis, often more like The reservation is still valid with stress on the fact that it is still valid.

It is possible in some contexts, but it is less neutral and sounds more marked.

In ordinary speech, the most natural version is:

• Az előjegyzés még érvényes.

Putting még before érvényes is the normal place if you mean still valid.

If you move még later, the sentence may sound stylistically unusual or strongly contrastive, depending on intonation.

So for a learner, the best pattern to remember is:

• [subject] + még + adjective
• Az előjegyzés még érvényes.

Yes. Érvényes is an adjective, and here it works as a predicate adjective.

That means it describes the subject:

• az előjegyzés = the reservation
• érvényes = valid

This is similar to English in:

• The reservation is valid.

The main difference is that Hungarian leaves out is in this kind of present-tense sentence.

A rough pronunciation guide:

• az ≈ awz
• előjegyzés ≈ EH-luh-yeg-yzays
• még ≈ mayg
• érvényes ≈ AIR-vay-nyesh

A few useful points:

• ő and é are long vowels
• gy is a single consonant sound, somewhat like the d in British duke or the dy in during, but softer
• ny sounds like Spanish ñ in señor
• s in Hungarian sounds like English sh
• sz in Hungarian sounds like English s

So érvényes ends with -nesh, not -ness.

Because it is the subject of the sentence, so it is in the basic dictionary form, which is often called the nominative.

Hungarian often marks grammatical roles with suffixes, but the subject usually has no ending.

So here:

• az előjegyzés = the reservation (subject)
• még érvényes = is still valid

If it had a different role, it might get a suffix:

• az előjegyzést = the reservation (object)
• az előjegyzésre = for the reservation / onto the reservation
• az előjegyzésből = from the reservation

But in your sentence, no extra ending is needed.

Sometimes yes, but they are not always exactly the same.

• foglalás usually means booking or reservation
• előjegyzés can be appointment, advance booking, pre-registration, or reservation, depending on context

So in some situations, both can be translated as reservation, but Hungarian speakers may choose one or the other depending on the exact type of reservation.

For example:

• hotel or restaurant booking: foglalás is often more natural
• medical or administrative appointment/reservation: előjegyzés may be more natural

So you should not assume they are always interchangeable.

The negative sentence is:

• Az előjegyzés már nem érvényes.

This means:

• The reservation is no longer valid.

Notice the common pattern:

• még érvényes = still valid
• már nem érvényes = no longer valid

This pair is very useful in Hungarian:

• még = still
• már nem = no longer

You would usually add a possessive ending:

• Az előjegyzésem még érvényes. = My reservation is still valid.

Here:

• előjegyzés = reservation
• előjegyzésem = my reservation

Some other examples:

• előjegyzésed = your reservation
• előjegyzése = his/her/your (formal) reservation
• előjegyzésünk = our reservation

So Hungarian often expresses possession directly on the noun instead of using a separate word like my.