Prodejce ukazuje energetickou třídu modelu.

Prodejce is the subject of the sentence, so it is in the nominative singular.

• Base form: prodejce
• Meaning: seller / salesperson / dealer

In Czech, the subject is usually in the nominative, just like he in He shows... in English.

A useful thing to notice is that prodejce is a masculine animate noun, even though its ending may not look very “masculine” to an English speaker.

Ukazuje is the 3rd person singular present tense form of ukazovat.

So it means:

• he shows
• she shows
• it shows

In this sentence, the subject is Prodejce, so the full sense is The salesperson shows...

Czech usually does not need a separate subject pronoun like he or she, because the verb form already tells you the person and number.

Because this phrase is the direct object of ukazuje, so it has to be in the accusative case.

The dictionary form is:

• energetická třída = energy class / energy rating

But in the accusative singular, it becomes:

• energetickou třídu

Both words change because the adjective and noun must agree in:

• gender: feminine
• number: singular
• case: accusative

So:

• nominative: energetická třída
• accusative: energetickou třídu

Modelu is in the genitive singular of model.

Here it means of the model, so the phrase:

• energetickou třídu modelu

literally means:

• the energy class of the model

This is a very common Czech structure: one noun followed by another noun in the genitive to show possession or relationship.

Examples:

• barva auta = the color of the car
• název knihy = the title of the book
• energetická třída modelu = the model’s energy class

The form modelu can match more than one case in Czech, but in this sentence it is understood as genitive singular.

Why?

Because it depends on the noun třídu and answers the question:

• energetickou třídu čeho?
• the energy class of what?
• modelu

So the function here is clearly genitive: of the model.

Czech normally has no articles, so it does not use words like the or a/an the way English does.

So:

• Prodejce can mean a salesperson or the salesperson
• modelu can mean of a model or of the model

Which one sounds best in English depends on the context and the translation choice.

Czech expresses definiteness mostly through:

• context
• word order
• emphasis
• shared knowledge

Yes. Czech word order is more flexible than English because the cases show what each word is doing.

The neutral, straightforward order here is:

• Prodejce ukazuje energetickou třídu modelu.

But other orders are possible, for example to change emphasis:

• Energetickou třídu modelu ukazuje prodejce.
• Modelu ukazuje prodejce energetickou třídu.
  (less neutral, more marked)

Even when the order changes, the cases still show that:

• Prodejce = subject
• energetickou třídu = direct object
• modelu = genitive dependent on třídu

So the basic meaning stays the same, but the focus or style changes.

Yes, ukazuje comes from ukazovat, which is imperfective.

That makes sense if you mean:

• a general action
• an ongoing action
• a neutral present-tense statement

So this sentence sounds like:

• The salesperson is showing the model’s energy class or
• The salesperson shows the model’s energy class

If you used a perfective verb such as ukáže, that would usually refer to a single completed act, often with a future meaning:

• Prodejce ukáže energetickou třídu modelu.
• The salesperson will show the model’s energy class.

So ukazuje is the natural choice for a plain present description.

Not always. Grammatically, prodejce is a masculine noun, but in real use it can sometimes function as a more general job title, depending on context.

If you want an explicitly feminine form, Czech commonly uses:

• prodejkyně = saleswoman / female salesperson

So:

• Prodejce ukazuje... usually suggests a male seller, or a generic seller in some contexts.
• Prodejkyně ukazuje... clearly refers to a female seller.

In Czech, adjectives must agree with the nouns they describe.

Here:

• třídu is feminine, singular, accusative
• so the adjective must also be feminine, singular, accusative

That is why you get:

• energetickou třídu

not, for example:

• energetický třídu
• energetická třídu

Those would be ungrammatical because the adjective would not match the noun correctly.

The dictionary forms are:

• prodejce → prodejce
• ukazuje → ukazovat
• energetickou → energetický
• třídu → třída
• modelu → model

So if you are looking the words up, those are the forms you would usually search for.