Z našeho domu jdeš rovně až na náměstí.

A word-by-word breakdown:

• Z = from / out of
• našeho domu = our house in the genitive case, because z requires genitive
• jdeš = you go / you walk; 2nd person singular of jít
• rovně = straight / straight ahead
• až = as far as / all the way to / until
• na náměstí = to the square, literally onto the square; na with motion takes the accusative here

So the sentence is structured like:

From our house, you go straight all the way to the square.

Because the preposition z always takes the genitive case.

The basic dictionary form is:

• náš dům = our house

But after z, both words must change into genitive:

• náš → našeho
• dům → domu

So:

• z našeho domu = from our house

This is one of the most important things to notice in Czech: prepositions often force a certain case.

Both z and ze mean from. The choice usually depends on pronunciation.

• z is the basic form
• ze is used when Czech speakers want the phrase to be easier to pronounce, especially before difficult consonant clusters

Here, z našeho domu is easy to say, so z is natural.

You would see ze in phrases like:

• ze školy = from school
• ze stolu = from the table

So in this sentence, z is simply the normal form.

In Czech, directions are often given with the present tense, not only with the imperative.

So jdeš rovně... literally means you go straight..., but in context it works like an instruction:

• Jdeš rovně... = Go straight...

This is very natural in spoken Czech when explaining a route.

Compare:

• Jdi rovně... = direct imperative, Go straight...
• Jdeš rovně... = literally You go straight..., but commonly used for giving directions

Both are possible, but jdeš sounds like someone is calmly walking you through the route.

Yes. Jdeš is 2nd person singular informal.

It is used when speaking to:

• one friend
• one child
• one person you address with ty

If you were speaking formally or to more than one person, you would use:

• jdete

So:

• Z našeho domu jdeš rovně až na náměstí. = informal singular
• Z našeho domu jdete rovně až na náměstí. = formal singular or plural

Rovně means straight, straight ahead, or directly forward.

In directions, it is very common:

• Jdi rovně. = Go straight.
• Pořád rovně. = Keep going straight.
• Jdeš rovně až na náměstí. = You go straight all the way to the square.

It does not mean directly in the sense of immediately here. It is about movement in a straight line.

Here až means something like:

• all the way to
• as far as
• until

So rovně až na náměstí means:

• straight all the way to the square
• straight until you reach the square

This is a very common Czech use of až with destinations or limits.

Examples:

• Jdi až ke kostelu. = Go as far as the church.
• Čekej až do večera. = Wait until evening.

So in your sentence, až marks the endpoint of the route.

Because Czech uses different prepositions for different kinds of places, and náměstí normally goes with na.

You say:

• na náměstí = to the square / on the square
• na náměstí jsem byl = I was at the square

This is just the normal Czech pattern for this noun.

In contrast, do is often used with enclosed spaces, towns, countries, buildings, and so on:

• do domu = into the house
• do Prahy = to Prague
• do školy = to school

But for náměstí, Czech says na náměstí.

Also note the case:

• motion toward a place with na → usually accusative
• location at a place with na → usually locative

In this sentence it is movement, so na náměstí is the motion form.

Yes, it is. This is a useful thing to notice.

The noun náměstí is a neuter noun, and in some cases its form stays the same. Here, after na expressing motion, it is in the accusative:

• dictionary form: náměstí
• accusative singular: náměstí

So the case changes grammatically, even though the word does not visibly change.

This is very common in Czech: some nouns have identical forms in different cases.

Yes, you might hear od našeho domu too, but it is slightly different in feel.

• z našeho domu = from our house / out of our house
• od našeho domu = from our house / starting from the area by our house

Very roughly:

• z often suggests movement out of something
• od often suggests movement away from a person or place

In route descriptions, od našeho domu can sound very natural if the idea is starting at our house rather than literally coming out from inside it.

So both can work depending on the exact situation.

Yes. Czech word order is flexible, though not completely free.

Your sentence begins with Z našeho domu, which sets the starting point first:

• Z našeho domu jdeš rovně až na náměstí.

You could also hear:

• Jdeš z našeho domu rovně až na náměstí.
• Rovně jdeš z našeho domu až na náměstí.
  though this one is less neutral and depends more on emphasis

The original version is very natural for directions because it starts with the point of departure.

So the word order here is not random: it sounds like the speaker is saying, Starting from our house, you go straight...

Good question, because English often uses just go for all of these.

• jdeš comes from jít and means you go on foot / you are going
• jedeš comes from jet and means you go by vehicle
• chodíš comes from chodit and often means you go habitually / regularly or repeated movement

So in directions for walking, jdeš is very natural:

• Pak jdeš rovně. = Then you go straight.

If someone were giving driving directions, they might say:

• Pak jedeš rovně. = Then you go straight.

So jdeš tells you this route is being described as walking movement.