Королева вошла в зал.

Because it is past tense feminine singular.

In Russian past tense, the verb agrees with the subject in gender and number:

• вошёл = he entered
• вошла = she entered
• вошло = it entered
• вошли = they entered

Since королева is feminine, the verb is вошла.

The dictionary form is войти, which means to enter / to go in.

So the forms are:

• войти = infinitive
• вошёл / вошла / вошли = past tense forms

This verb is a little irregular, so the past form does not look exactly like the infinitive.

Because войти means to go in, to enter, while идти just means to go / to be going.

Compare:

• Королева шла в зал. = The queen was walking toward the hall.
• Королева вошла в зал. = The queen entered the hall.

So вошла focuses on the fact that she crossed into the hall.

This is normal in Russian.

• The verb войти already has the idea of entering
• The preposition в still introduces the destination: into the hall

So Russian says, literally, something like entered into the hall.

You normally need both parts:

• вошла в зал = correct
• вошла зал = incorrect

This is very common with verbs of motion in Russian.

Because Russian uses different cases depending on whether you mean motion into a place or location in a place.

After в:

• accusative = motion into
• prepositional = location in

So:

• в зал = into the hall
• в зале = in the hall

Since the queen is entering the hall, Russian uses в + accusative.

It actually is in the accusative case, but for an inanimate masculine singular noun, the accusative often looks exactly the same as the nominative.

So:

• зал = nominative
• зал = accusative

There is no visible change here, but the case is still accusative because of the meaning and the preposition в.

Russian does not have articles like a and the.

So Королева вошла в зал can mean:

• The queen entered the hall
• sometimes, depending on context, A queen entered a hall

Usually the context tells you which one is meant. In many learning materials, this sentence is translated with the because the situation sounds specific.

Yes. Russian word order is more flexible than English because case endings show the grammatical relationships.

For example:

• Королева вошла в зал. = neutral, straightforward
• В зал вошла королева. = Into the hall came the queen; this puts more focus on the hall or creates a more literary effect

The basic meaning stays the same, but the emphasis changes.

Войти / вошла is perfective.

That means it presents the action as completed: the queen successfully entered the hall.

Its imperfective partner is входить. Compare:

• Королева вошла в зал. = The queen entered the hall.
  Completed event.
• Королева входила в зал. = The queen was entering the hall / used to enter the hall.
  Process, repeated action, or background description.

In this sentence, the natural choice is вошла because it describes a single completed event.

The main stresses are:

• королЕва
• вошлА
• зал (monosyllabic, so the stress is on that syllable)

So roughly:

королЕва вошлА в зал

A few pronunciation notes:

• вошла is pronounced with stress on the last -а
• unstressed о in Russian is often pronounced more like a reduced vowel, not a clear English o

A rough English-style approximation would be: kər-a-LYE-va va-shLA v zal

But it is best to learn it from audio if possible.

Because it is the subject of the sentence: the person performing the action.

Russian normally uses:

• nominative for the subject
• another case, if needed, for objects or destinations

So:

• Королева = nominative subject
• в зал = prepositional phrase showing direction

The structure is:

[subject] + [verb] + [destination]

So the queen is the one who entered, and the hall is where she entered.