Redar stoji na ulazu.

Redar is a masculine noun meaning something like usher, steward, attendant, or security guard/orderly, depending on context.

It is a fairly broad word. For example:

• at a concert or stadium: steward
• in a cinema or event hall: usher
• in a public or official setting: attendant or guard

So the exact English translation depends on the situation.

Stoji is the 3rd person singular present tense of stajati, meaning to stand.

So Redar stoji na ulazu literally means The usher/guard is standing at the entrance.

In Croatian, stajati can also sometimes mean to be positioned or to remain standing, so it may sound slightly more physical and visual than a simple English is.

Because after na when it means location—here, at/on—Croatian uses the locative case.

The base form is:

• ulaz = entrance

After na for location, it becomes:

• na ulazu = at the entrance

So:

• ulaz = nominative
• na ulazu = locative singular

In this sentence, na ulazu is the natural Croatian expression for at the entrance.

A useful contrast is:

• na ulazu = at the entrance
• u ulazu = in the entrance / in the entryway

So na is used because the person is located at the entrance, not necessarily inside the entrance area.

Croatian does not have articles like a or the.

So redar can mean:

• a guard
• the guard

And ulazu can mean:

• an entrance
• the entrance

Which one is meant depends on context. In many situations, English would naturally translate this as The guard is standing at the entrance or A guard is standing at the entrance depending on what has already been mentioned.

It can mean both.

Croatian present tense often covers both:

• stands
• is standing

So Redar stoji na ulazu could mean:

• The guard stands at the entrance
  or more naturally in many contexts:
• The guard is standing at the entrance

The exact English choice depends on whether the situation is habitual or happening right now.

Yes. Redar je na ulazu means The guard is at the entrance.

The difference is:

• Redar stoji na ulazu = focuses on the fact that the guard is standing
• Redar je na ulazu = focuses on the guard’s location

So both are possible, but they are not exactly identical in emphasis.

Yes. Croatian word order is more flexible than English word order.

The neutral order here is:

• Redar stoji na ulazu.

But you could also hear:

• Na ulazu stoji redar.

That version puts more emphasis on the entrance/location first, similar to At the entrance, a guard is standing.

Croatian word order often changes for emphasis, topic, or style rather than basic grammatical correctness.

Redar is a masculine noun.

Its dictionary form is nominative singular:

• redar

Because it refers to a person, it is also animate, which matters in some case forms.

A feminine equivalent can be:

• redarka

So if you wanted to refer specifically to a female usher/guard, you might use redarka.

Yes. Ulaz is also a masculine noun.

Its basic form is:

• ulaz = entrance

In this sentence, after na expressing location, it becomes:

• ulazu

So this is a normal masculine singular locative form.

It can be either, depending on context.

Croatian present tense often allows both readings:

• right now: A guard is standing at the entrance
• general/habitual: A guard stands at the entrance

If you saw this sentence alone, many learners would most naturally understand it as a present scene: The guard is standing at the entrance. But context always decides.