Dnes večer musím psát úkol do školy.

In Czech, dnes means today and večer means evening.

Together, dnes večer is a very common way to say:

• this evening
• tonight

It is more natural in Czech than trying to translate English word-for-word. So:

• Dnes večer = Tonight / This evening

Czech often leaves out subject pronouns when they are clear from the verb ending.

Here, musím means I must / I have to, so the I is already built into the verb form.

• musím = I must
• musíš = you must
• musí = he/she/it must

So já is not necessary here, though you could add it for emphasis:

• Já dnes večer musím psát úkol do školy.
  = I have to write the assignment tonight.

Musím is the 1st person singular form of muset, which means must / have to.

So:

• muset = to have to, must
• musím = I have to / I must

In this sentence:

• musím psát = I have to write

Even though musím is present tense in form, it can refer to a future obligation when a time expression makes that clear:

• Dnes večer musím... = Tonight I have to...

After modal verbs like muset (must / have to), Czech normally uses the infinitive.

So:

• musím psát = I have to write
• not musím píšu

This is similar to English:

• I have to write
• not I have to am writing

So the pattern is:

• musím + infinitive

This is a question about aspect, which is very important in Czech.

• psát = imperfective = to write, to be writing, to write as an activity
• napsat = perfective = to write down, to complete, to finish writing

So:

• musím psát úkol focuses on the activity of writing
• musím napsat úkol would stress that the assignment needs to be completed

In many situations, Czech speakers might actually prefer napsat if they mean I have to get the homework done tonight. But psát is still understandable and natural if the focus is simply on the action of writing.

Literally, úkol means task, assignment, or piece of work.

Depending on context, it can mean:

• a task
• an assignment
• homework

In school contexts, úkol do školy usually means a school assignment or homework.

If you want to be more explicit, Czech often says:

• domácí úkol = homework

So this sentence could sound like:

• I have to write an assignment for school tonight
• or more naturally in English, I have to do/write my homework tonight, depending on context

Here úkol is the direct object of psát, so it is in the accusative case.

But úkol is a masculine inanimate noun, and for many masculine inanimate nouns, the accusative singular looks the same as the nominative singular.

So:

• nominative: úkol
• accusative: úkol

That is why the form does not visibly change.

Literally:

• do = into / to
• školy = of school / school (genitive form)

So do školy literally means to school.

But in Czech, úkol do školy is a natural expression meaning something like:

• an assignment for school
• homework to take to school
• school homework

So in this sentence, do školy tells you that the assignment is school-related.

It is not mainly about physical movement here; it is part of the meaning of the noun phrase.

Because the preposition do requires the genitive case.

The basic form is:

• škola = school

After do, it changes:

• do školy = to school / into school / for school, depending on context

So:

• do + genitive

This is one of the case patterns you need to learn with prepositions in Czech.

Yes. Czech word order is more flexible than English, because endings carry a lot of grammatical information.

The given sentence:

• Dnes večer musím psát úkol do školy.

is a normal, neutral order.

You could also hear other orders, depending on emphasis, for example:

• Musím dnes večer psát úkol do školy.
• Úkol do školy musím dnes večer psát.

These all keep roughly the same basic meaning, but the focus changes slightly.

For learners, the original order is a good neutral model.

Czech has no articles.

So where English says:

• I have to write the homework
• I have to write an assignment

Czech simply says:

• musím psát úkol

The exact meaning—a task, the assignment, my homework—comes from context.

This is normal in Czech, and learners need to get used to understanding definiteness from the situation rather than from articles.

Not exactly.

• Dnes večer musím... = Tonight I have to...
• Dnes večer budu muset... = Tonight I will have to...

The first one is the usual simple way to express an obligation that applies later today. Czech often uses the present tense for this when the time is clear.

The second one sounds a bit more explicitly future-oriented and can sometimes feel heavier or more formal depending on context.

In everyday speech, musím is very common here.

Czech stress is usually on the first syllable of each word.

A simple pronunciation guide:

• Dnes = roughly dness
• večer = VEH-cher
• musím = MOO-seem
• psát = psaat (with a long á)
• úkol = OO-kol
• do školy = do SHKO-lee

A rough full pronunciation:

• DNES VEH-cher MOO-seem psaat OO-kol do SHKO-lee

A few useful notes:

• š sounds like sh
• č sounds like ch in church
• á and ú are long vowels

Yes, depending on exactly what they mean.

Some common alternatives are:

• Dnes večer musím napsat úkol do školy.
  Emphasizes finishing the assignment.

• Dnes večer musím dělat domácí úkol.
  = Tonight I have to do homework.

• Dnes večer musím udělat domácí úkol.
  = Tonight I have to get my homework done.

So the original sentence is fine, but in real life you may hear these alternatives too, especially if the speaker means homework more generally rather than specifically writing.