Když přijedeme do hotelu pozdě večer, recepce je ještě otevřená a metro už nejede.

Here když means when:

• Když přijedeme do hotelu... = When we arrive at the hotel...

In Czech, když is most commonly used for time clauses like when. In some contexts, English might use if, but in this sentence the meaning is clearly temporal: it describes what is true at the time of arrival.

Also, Czech normally uses a comma before the main clause after a když clause:

• Když přijedeme do hotelu pozdě večer, recepce je ještě otevřená...

Because Když přijedeme do hotelu pozdě večer is a subordinate clause introduced by když.

Czech punctuation regularly separates this kind of clause from the main clause with a comma:

• Když přijedeme do hotelu pozdě večer,
  recepce je ještě otevřená a metro už nejede.

This is very standard in Czech.

Yes, the form looks like a present-tense form, but it comes from a perfective verb, přijet, so it has future meaning.

• přijet = to arrive (by vehicle), perfective
• přijedeme = we will arrive

In Czech, perfective verbs do not normally have a true present meaning. Their “present” forms usually refer to the future.

So:

• Když přijedeme... = When we arrive / When we will have arrived

This is completely normal Czech grammar.

Because přijet means to arrive by some vehicle / to come by transport, while přijít means to come on foot.

So:

• přijet = arrive by car, train, bus, plane, etc.
• přijít = arrive on foot

With hotel, both can be possible depending on the situation, but přijedeme do hotelu strongly suggests arriving by some form of transport, which is very natural in travel contexts.

Because Czech verb endings usually show the subject clearly, so pronouns are often omitted.

• přijedeme = we will arrive

The ending -eme tells you the subject is we.

Czech often leaves out subject pronouns unless they are needed for emphasis or contrast. So:

• Přijedeme pozdě. = We’ll arrive late.
• My přijedeme pozdě. = We will arrive late.
  (This sounds more emphatic.)

Because the preposition do requires the genitive case.

• hotel = nominative
• do hotelu = genitive after do

The preposition do usually means into / to and is used with destinations in the sense of going inside or into a place.

Examples:

• do hotelu = to the hotel
• do města = to the city
• do školy = to school

So přijedeme do hotelu is the correct form.

Pozdě večer means late in the evening or late at night, depending on context.

Word by word:

• pozdě = late
• večer = evening

Together they form a natural time expression:

• přijedeme do hotelu pozdě večer = we arrive at the hotel late in the evening

Czech often uses this kind of simple adverb + time noun combination.

Because recepce is a feminine singular noun, and the adjective must agree with it.

• recepce = reception/front desk (feminine)
• otevřená = open (feminine singular)

This is standard adjective agreement in Czech.

Compare:

• hotel je otevřený = the hotel is open
  (hotel is masculine)
• recepce je otevřená = the reception/front desk is open
  (recepce is feminine)
• metro je otevřené = the metro is open
  (metro is neuter)

Here otevřená is a predicate adjective after je, but it still agrees in gender and number with the noun.

In a hotel context, recepce usually means the reception desk/front desk or the hotel reception service in general.

So:

• recepce je ještě otevřená
  = the reception/front desk is still open

English often says the reception is still open, the front desk is still open, or reception is still open. Czech recepce covers that hotel-service idea naturally.

These two small words are very common and very important:

• ještě = still / yet
• už = already / any more / no longer depending on context

In this sentence:

• recepce je ještě otevřená = the reception is still open
• metro už nejede = the metro is no longer running

So the contrast is:

• ještě = something continues
• už = something has already changed

This pair is extremely common in Czech.

Because už combined with a negative verb often gives the meaning no longer / not any more.

• jede = it runs / it is going
• nejede = it is not running / it is not going
• už nejede = it is no longer running

So although už often means already, with negation the natural English translation is often:

• už ne = no longer / not any more

Examples:

• Už spí. = He’s already asleep.
• Už nespí. = He’s no longer asleep.

Because jet is the normal Czech verb for a vehicle or means of transport going / running / operating.

So:

• metro jede = the metro is running / going
• metro nejede = the metro is not running

This is very natural Czech for transport systems. English might say:

• the metro isn’t running
• the metro has stopped running
• the metro doesn’t run any more

Czech uses jet for many kinds of transport:

• Vlak jede v šest. = The train leaves/runs at six.
• Autobus nejede. = The bus isn’t running.

Here metro is in the nominative singular, because it is the subject of nejede.

• metro už nejede = the metro is no longer running

A useful thing to know is that metro is a neuter noun, and in the singular it often has the same form in several cases, especially in basic use. So learners often see metro unchanged.

Also, Czech borrowed metro as a neuter noun, which is why you get agreement like:

• to metro = that metro
• pražské metro = the Prague metro

Yes, Czech word order is flexible, but the version in the sentence is very natural.

Given sentence:

• Když přijedeme do hotelu pozdě večer, recepce je ještě otevřená a metro už nejede.

This order sounds neutral and clear.

You could move some adverbs for emphasis, for example:

• Když přijedeme do hotelu pozdě večer, ještě je recepce otevřená...
• ...a už metro nejede.

But these versions may sound more marked or stylistically different. For learners, the original sentence is a very good neutral model.

Because Czech often uses present forms to describe a general fact or situation that will be true at that time.

The sentence means something like:

• When we arrive late in the evening, the reception is still open and the metro is no longer running.

Even in English, this kind of structure is normal:

• When we get there, the reception is still open.

Czech does the same. The když clause refers to a future moment, and the main clause states what the situation is at that moment.

Here a simply means and.

It links two coordinated statements:

• recepce je ještě otevřená
• metro už nejede

So:

• recepce je ještě otevřená a metro už nejede
• the reception is still open and the metro is no longer running

Nothing unusual is happening here; it is the normal coordinating conjunction and.

Very naturally as a travel situation:

• When we get to the hotel late in the evening, the reception is still open, but the metro is no longer running.

Even though the Czech uses a = and, English may sometimes prefer but to make the contrast sound smoother. But the Czech sentence itself is perfectly natural as written.

The key ideas are:

• arrival happens in the future: přijedeme
• destination uses do + genitive: do hotelu
• hotel front desk is still open: recepce je ještě otevřená
• metro has already stopped running: metro už nejede