Перед тем как идти в комнату, лучше разуваться в прихожей.

Перед тем как is a very common Russian way to say before doing something or before something happens.

In this sentence, it introduces the action that happens first:

Перед тем как идти в комнату = before going into the room

Literally, the phrase is built from:

• перед = before
• тем = that
• как = how/as

But together, перед тем как works as a fixed expression meaning before.

A simpler English translation is best; you usually should not translate it word for word.

Because the sentence is giving a general rule or recommendation, not talking about one specific named person.

Russian often uses the infinitive in patterns like this:

• Перед тем как идти...
• Перед тем как войти...
• Перед тем как есть...

This is similar to English before going, before entering, before eating.

The implied subject is general: you / people / one.

If you wanted a full clause with a subject, you could say something like:

Перед тем как вы войдёте в комнату...
= Before you enter the room...

But in general advice, the infinitive is very natural.

Because в комнату shows motion into the room.

With в:

• в комнату = into the room or to the room → direction, so accusative
• в комнате = in the room → location, so prepositional

So:

• идти в комнату = to go into the room
• быть в комнате = to be in the room

This is a very important Russian pattern:

• motion toward a place → accusative
• being in a place → prepositional

This is mainly about aspect.

• разуваться = imperfective
• разуться = perfective

In this sentence, разуваться sounds like a general habit, rule, or recommendation:

лучше разуваться в прихожей
= it’s better to take your shoes off in the hallway

That feels like general advice or a house rule.

If you say разуться, it sounds more like a single completed action:

Перед тем как идти в комнату, лучше разуться в прихожей.

That version is also possible, but it feels a bit more like do this now, once, rather than this is the proper practice.

Here -ся makes the verb reflexive, meaning the action is done to oneself.

• разувать кого-то = to take someone’s shoes off
• разуваться = to take off one’s own shoes

So in this sentence, people are removing their own shoes.

This is very common with clothing-related verbs:

• одевать ребёнка = dress a child

• одеваться = get dressed

• обувать ребёнка = put shoes on a child

• обуваться = put on one’s own shoes

• разувать ребёнка = take a child’s shoes off
• разуваться = take off one’s own shoes

Yes, лучше literally means better, but in this kind of sentence it functions as an impersonal recommendation:

лучше разуваться в прихожей
= it’s better to take your shoes off in the hallway

This is a softer, more polite way to give advice than stronger words like:

• нужно = it is necessary
• надо = one must / needs to

So:

• лучше разуваться в прихожей = better to do this
• надо разуваться в прихожей = you need to do this

The version with лучше sounds less forceful.

Because Russian often leaves the subject unstated in general statements.

In English, you might say:

• Before you go into the room, it’s better to take your shoes off in the hallway.

In Russian, the sentence can stay impersonal:

Перед тем как идти в комнату, лучше разуваться в прихожей.

The meaning is still understood as something like:

• you should
• people should
• one should

This kind of subjectless structure is very common in Russian instructions, advice, and rules.

В прихожей is prepositional case, because it shows a static location: the place where the shoes should be taken off.

• в прихожую = into the hallway → motion, accusative
• в прихожей = in the hallway → location, prepositional

Here the action разуваться happens in that place, so Russian uses the location form:

в прихожей

Also, прихожая is a feminine noun, and in the prepositional singular it becomes прихожей.

Because Перед тем как идти в комнату is the subordinate part of the sentence, and лучше разуваться в прихожей is the main part.

So the structure is:

• Before going into the room,
• it is better to take your shoes off in the hallway.

Russian separates these parts with a comma, just as English often does with an introductory clause.

Also, in this sentence there is no comma inside перед тем как. It is treated as one unit here:

Перед тем как идти в комнату, ...

Yes, it could.

Compare:

• идти в комнату = to go into the room / to be on the way into the room
• войти в комнату = to enter the room

The difference is aspect and focus:

• идти focuses more on the movement/process
• войти focuses more on the completed act of entering

So:

Перед тем как войти в комнату, лучше разуться в прихожей.

is also natural, and many learners may actually find it easier to connect with English before entering the room.

The original sentence is still correct; it just uses a slightly different verbal perspective.

It sounds like a general rule or customary advice.

That effect comes from several things working together:

• the impersonal structure
• the infinitive
• the use of лучше
• the imperfective разуваться

So it feels like:

• As a rule, it’s better to take your shoes off in the hallway before going into a room.

If you wanted a more specific one-time instruction, Russian might more naturally say something like:

Перед тем как войти в комнату, лучше разуться в прихожей.

That version sounds more tied to a particular occasion.

Yes. Прежде чем also means before and is very common.

For example:

Прежде чем идти в комнату, лучше разуваться в прихожей.

This is grammatical and natural.

A rough difference:

• перед тем как = very common, straightforward
• прежде чем = also common, sometimes a little more formal or bookish in tone

In everyday Russian, both are perfectly normal.