Posádka projede přes vodní proud.

Czech has no articles, so there is no direct equivalent of the or a/an.

That means:

• posádka can mean a crew or the crew
• vodní proud can mean a water current or the water current

The context tells you which one is meant.

Projede is the 3rd person singular form of the verb projet.

It matches the subject posádka, which is grammatically singular:

• posádka projede = the crew will get through / will pass through

Even though the form looks like a present-tense form, projet is a perfective verb, so this kind of form is usually translated as future in English.

In Czech, perfective verbs do not normally express a true present action. Their present-looking forms usually refer to a completed action in the future.

So:

• projede literally looks like a present form
• but in meaning it is future: will get through, will pass across

This is a very common Czech pattern.

The basic verb jet means to go / travel by vehicle.

Adding pro- gives projet, which suggests passing through, getting across, or making it through something completely.

So projede is stronger than just goes. It suggests something like:

• will get through
• will pass through
• will make it across

depending on context.

Because posádka is grammatically singular.

Czech verbs agree with the grammatical number of the noun, not with the actual number of people involved. So even though a crew contains multiple people, the sentence uses singular agreement:

• Posádka projede
• not Posádka projedou

This works much like English The crew is... in standard singular usage.

Přes usually means across, over, or sometimes through, and it takes the accusative case.

Here it shows what the crew will move across or through:

• přes vodní proud = across/through the water current

So after přes, you expect the noun phrase to be in the accusative.

It is in the accusative singular, because it follows přes.

But it does not visibly change much here:

• proud is a masculine inanimate noun, and for many masculine inanimate nouns, the accusative singular is identical to the nominative singular
• vodní also stays the same in this form

So although the phrase is grammatically accusative, it looks the same as the dictionary form:

• nominative: vodní proud
• accusative: vodní proud

It means water current.

More literally:

• vodní = water / aquatic / water-related
• proud = current, flow, stream

In natural English, current is usually the best translation here. Depending on context, stream of water or water flow could also make sense, but water current is the most straightforward reading.

Yes. Czech word order is fairly flexible because case endings help show each word's role.

The sentence

• Posádka projede přes vodní proud.

is a neutral, straightforward order: subject + verb + rest.

You could also change the order, for example:

• Přes vodní proud projede posádka.

That would still mean basically the same thing, but the emphasis would shift. The original version is the most neutral and easiest for learners to process.

Roughly PRO-ye-de.

A few helpful points:

• j in Czech sounds like English y in yes
• Czech stress is normally on the first syllable
• so projede is stressed on pro-

In the full sentence, the rough rhythm is:

• PO-sád-ka PRO-ye-de přes VOD-ní proud

The hardest part for many English speakers is ř in přes, because it is a special Czech sound with no exact English equivalent.