Musíme větrat pokoj.

Because Czech usually leaves subject pronouns out when they are not needed.

The verb musíme already tells you the subject is we, because the ending -íme marks 1st person plural. So:

• Musíme větrat pokoj. = We must / have to air out the room.
• My musíme větrat pokoj. also works, but my is usually added only for emphasis, contrast, or clarity.

So the version without my sounds normal and natural.

Musíme is the 1st person plural present tense form of muset, which means must / have to.

A few forms of muset are:

• musím = I must
• musíš = you must
• musí = he/she/it must
• musíme = we must
• musíte = you must
• musí = they must

So musíme means:

• we must
• we have to
• sometimes we need to, depending on context

Because after a modal verb like muset (must / have to), Czech normally uses the infinitive of the main verb.

So the structure is:

• musíme
  • větrat
• we must
  • air out / ventilate

This is very similar to English:

• We must air out the room.

Other examples:

• Musím jít. = I must go.
• Musíme pracovat. = We must work.
• Musíte čekat. = You must wait.

So větrat stays in the infinitive because it depends on the modal verb musíme.

Větrat means to air out, to ventilate, or to let fresh air in.

In everyday Czech, větrat is very commonly used for opening windows and refreshing the air in a room. In English, air out the room is often the most natural translation in ordinary situations.

So:

• větrat pokoj = air out the room
• větrat byt = air out the apartment
• větrat kancelář = air out the office

It is a very normal everyday verb, not just a technical word.

Pokoj is the direct object of větrat, so it is in the accusative case.

However, pokoj is a masculine inanimate noun, and in the singular, its accusative form is the same as its nominative form.

So:

• nominative: pokoj
• accusative: pokoj

That is why the word does not visibly change here.

Compare with a feminine noun, where the accusative often does change:

• místnost can also stay the same in form
• but with nouns like kuchyně, forms may differ depending on the pattern

So the important point is: pokoj is in the accusative, even though it looks the same as the dictionary form.

It can mean both.

In many contexts, Czech muset covers both English ideas:

• must
• have to

So Musíme větrat pokoj could be translated as:

• We must air out the room.
• We have to air out the room.

Which English version sounds best depends on context and style. Czech does not always make the same distinction that English sometimes does between strong internal obligation (must) and external necessity (have to).

No, Czech word order is relatively flexible, although some orders sound more neutral than others.

Musíme větrat pokoj is a normal, neutral order.

You could also hear:

• Pokoj musíme větrat.
• Musíme pokoj větrat.

These versions change the focus or emphasis, not the basic meaning.

Very roughly:

• Musíme větrat pokoj. = neutral
• Pokoj musíme větrat. = emphasis on the room
• Musíme pokoj větrat. = possible emphasis on the room as the object before the infinitive

So the original sentence is a natural default word order, but it is not the only possible one.

A helpful approximate pronunciation is:

moo-ZHEE-meh VYEH-traht POH-koy

A few key points:

• Czech stress is usually on the first syllable of each word:

  • MU-sí-me
  • VĚ-trat
  • PO-koj

• í in musíme is a long vowel

• ě in větrat is special: after v, it sounds roughly like vye or vyeh, so větrat begins something like vyeh-

• j in pokoj sounds like English y in yes

  • so pokoj is roughly po-koy

A more technical IPA-style version would be approximately: [ˈmusiːmɛ ˈvjɛtrat ˈpokoj]

Because Czech has no articles.

Unlike English, Czech does not have words corresponding directly to a/an and the. Whether pokoj means a room or the room depends on context.

So pokoj can mean:

• a room
• the room

In this sentence, English usually needs an article, so you translate according to the situation:

• We must air out the room.
• We must air out a room.

Most likely, in an ordinary context, the room is the natural translation.

Yes. Větrat is the imperfective verb.

That means it presents the action as:

• ongoing
• repeated
• general
• without focusing on completion

The perfective partner is often vyvětrat, which means something like to air out completely / successfully.

So there is a difference in nuance:

• Musíme větrat pokoj. = We need to be airing out the room / We need to ventilate the room.
• Musíme vyvětrat pokoj. = We need to air out the room fully / get the room aired out.

In many practical situations, both can be possible, but the aspect changes the viewpoint:

• větrat = process or general activity
• vyvětrat = completed result

Yes, pokoj can mean both room and peace, but context makes the meaning clear.

In this sentence, because it follows větrat (to air out / ventilate), it clearly means room:

• Musíme větrat pokoj. = We must air out the room.

It would not make sense here as peace.

This is a good example of how Czech, like English, can have one word with multiple meanings that are easy to distinguish in context.