Mám zájem o tento program.

Because Czech often expresses to be interested in with the phrase mít zájem o + accusative, literally to have interest in.

So:

• mám = I have
• zájem = interest
• o tento program = in this program

This is a very normal Czech expression. English uses I am interested in..., but Czech often uses I have interest in... in this situation.

A close alternative is:

• Zajímám se o tento program. = I am interested in this program / I take an interest in this program.

The two are similar, but mám zájem o... can sound a bit more definite or practical in some contexts.

Mám is the 1st person singular present tense of the verb mít = to have.

So:

• já mám = I have
• ty máš = you have
• on/ona má = he/she has
• my máme = we have
• vy máte = you have
• oni mají = they have

In Czech, the subject pronoun já is often omitted, because mám already shows that the subject is I.

So Mám zájem... naturally means I am interested... / I have an interest... without needing já.

The noun zájem normally goes with the preposition o when you say what someone is interested in.

So the pattern is:

• mít zájem o něco = to be interested in something

Examples:

• Mám zájem o kurz. = I’m interested in the course.
• Má zájem o práci. = He/She is interested in the job.

You should learn zájem together with o, because they commonly belong together.

Great question. The preposition o can take different cases depending on meaning.

With zájem o, Czech uses the accusative:

• mít zájem o něco = to be interested in something

So here:

• o tento program = accusative

But when o means about in the sense of talking or thinking about something, it often takes the locative:

• Mluvíme o tomto programu. = We are talking about this program.

So compare:

• Mám zájem o tento program. = I am interested in this program.
• Mluvíme o tomto programu. = We are talking about this program.

Same preposition, different pattern.

It is accusative singular.

The phrase mít zájem o něco requires the accusative, so both words are in the accusative:

• tento = accusative singular masculine inanimate demonstrative
• program = accusative singular masculine inanimate noun

However, for masculine inanimate nouns, the accusative is often the same as the nominative. That is why program does not visibly change here.

So:

• nominative: tento program
• accusative: tento program

They look the same, but the grammatical role is different.

Both are possible, but they are a little different in feel.

• tento program = this program more explicitly
• ten program = often that program, but in everyday Czech it can also function a bit like the/that/this depending on context

So tento is clearer if you specifically want to say this.

In normal conversation, many speakers often prefer ten more than learners expect. But tento program is absolutely correct and is a good, clear textbook form.

Yes, absolutely.

Czech word order is flexible, so these are both correct:

• Mám zájem o tento program.
• O tento program mám zájem.

The second version puts more emphasis on o tento program — as if you are highlighting this program in particular.

A third possible order is:

• Mám o tento program zájem.

This is also correct, though the most neutral version is usually:

• Mám zájem o tento program.

Both can be translated as I’m interested in this program, but they are not identical.

• Zajímá mě tento program. = This program interests me.
  • This often expresses personal curiosity or interest.
• Mám zájem o tento program. = I have an interest in this program.
  • This can sound a bit more deliberate, formal, or practical.

For example:

• Zajímá mě historie. = History interests me.
• Mám zájem o tento kurz. = I’m interested in this course (possibly as a participant or applicant)

So in many situations they overlap, but mám zájem o can sound more concrete.

You simply negate mám:

• Nemám zájem o tento program.

That means I am not interested in this program.

This is a very common phrase in Czech:

• Nemám zájem. = I’m not interested.

It is pronounced approximately ZAA-yem.

A few points:

• á is a long vowel, so it is held a bit longer.
• The j in Czech sounds like English y in yes.
• The stress is on the first syllable, as usual in Czech.

So:

• zájem ≈ ZAA-yem

And the whole sentence is approximately:

• Mám zájem o tento program.
• maam ZAA-yem o TEN-to PRO-gram

That is only an approximation for English speakers, but it is a useful start.

Yes. Program is masculine inanimate.

That matters because adjectives and demonstratives must agree with it:

• ten program
• tento program
• dobrý program

And because it is masculine inanimate, its accusative singular is the same as the nominative singular, which is why you see:

• program rather than a changed form

That is also why tento program looks unchanged in this sentence even though it is in the accusative.