Der Eintritt ist umsonst.

Because Eintritt is a masculine noun in German, so it takes the nominative article der here.

• der Eintritt = admission / entry
• nominative masculine singular article = der

In this sentence, Eintritt is the subject, so the nominative form is used:

• Der Eintritt ist umsonst.

In this sentence, Eintritt means admission, entry, or entrance fee, depending on context.

So Der Eintritt ist umsonst usually means:

• admission is free
• there is no entry fee

A learner should note that Eintritt does not usually mean the physical doorway. It is more about the act or price of entering.

German main clauses normally follow the verb-second rule, often called V2. That means the conjugated verb comes in the second position.

Here the structure is:

• Der Eintritt = subject
• ist = conjugated verb
• umsonst = complement

So:

• Der Eintritt ist umsonst.

This is very normal German word order.

Here, umsonst functions like an adjective/adverbial predicate, describing the state of Eintritt.

It means free of charge here.

After sein, German often uses words like this without extra endings:

• Der Eintritt ist kostenlos.
• Der Eintritt ist frei.
• Der Eintritt ist umsonst.

So you do not say umsonste or add adjective endings here.

Often, yes. In many situations they both mean free or free of charge.

Examples:

• Der Eintritt ist kostenlos.
• Der Eintritt ist umsonst.

Both can mean that no money is required.

However, umsonst also has another meaning: for nothing in the sense of in vain or pointlessly.

For example:

• Ich habe umsonst gewartet. = I waited in vain.

So in context, Der Eintritt ist umsonst is clearly about cost, but learners should know that umsonst has this second meaning too.

Yes. Der Eintritt ist frei is very common and natural.

All of these can work:

• Der Eintritt ist umsonst.
• Der Eintritt ist kostenlos.
• Der Eintritt ist frei.

There can be slight differences in tone or style, but all are standard ways to say that admission costs nothing.

Because German does not need the same structure as English here. English often says:

• Admission is free.
• Admission is for free. (less standard in many varieties of English)

German simply says:

• Der Eintritt ist umsonst.

The word umsonst already carries the idea of free of charge, so no extra preposition or article is needed.

A simple pronunciation guide:

• Eintritt ≈ EIN-trit

  • ein sounds a bit like English mine without the m
  • stress is on the first syllable

• umsonst ≈ oom-ZONST

  • stress is on sonst

So the whole sentence is roughly:

• dare EIN-trit ist oom-ZONST

That is only an approximation, but it helps with the stress.

Yes, but not in this sentence.

Singular:

• der Eintritt = admission / entry

Plural:

• die Eintritte

However, the plural is less common in everyday use when talking about ticket prices or entry in general. Often German uses the singular as a general concept:

• Der Eintritt ist umsonst.

Normally, no. In standard German, countable singular nouns usually need an article or some determiner.

So:

• Der Eintritt ist umsonst. = correct

Without the article:

• Eintritt ist umsonst. = usually not standard in this context

German is less willing than English to drop articles before singular countable nouns.

It is in the nominative case, because it is the subject of the sentence.

You can identify it like this:

• Who or what is free?
  Der Eintritt

So:

• der = nominative masculine singular
• Eintritt = subject

It is neutral and completely normal.

You could see it:

• on a sign
• on a website
• in an announcement
• in conversation

It is neither especially formal nor especially casual. It is a standard everyday sentence.