Sprzedawca energii wyjaśnia taryfę.

Because taryfa is the direct object of the verb wyjaśnia (explains), so it goes into the accusative case.

• nominative: taryfa = tariff / rate plan
• accusative: taryfę

So:

• Taryfa jest skomplikowana. = The tariff is complicated.
  Here taryfa is the subject.
• Sprzedawca energii wyjaśnia taryfę. = The energy seller explains the tariff.
  Here taryfę is the object.

Because energii is in the genitive case. In sprzedawca energii, the meaning is seller of energy.

This is a very common Polish pattern:

• sprzedawca chleba = seller of bread
• producent samochodów = producer of cars
• dostawca internetu = provider of internet
• sprzedawca energii = seller/provider of energy

So energia changes to energii because it depends on the noun sprzedawca and means of energy.

Because some masculine personal nouns in Polish end in -a even though they are grammatically masculine.

Examples:

• mężczyzna = man
• kolega = male friend / colleague
• sprzedawca = salesman / seller

So even though sprzedawca looks a bit like a feminine noun, it behaves as a masculine personal noun in grammar.

For example:

• Ten sprzedawca jest miły. = This salesman is nice.

Notice ten and miły, which are masculine forms.

You should think of it as a noun phrase:

• sprzedawca = seller
• energii = of energy

Together: energy seller or seller/provider of energy

Polish often uses this structure where English might use either:

• of
• a compound noun
• an adjective

So sprzedawca energii is very natural Polish, even though English might prefer energy supplier in many contexts.

Wyjaśnia means explains or is explaining, depending on context.

It comes from the verb wyjaśniać, which is imperfective. Because of that, the present tense can mean:

• a general/habitual action: explains
• an action happening now: is explaining

So the sentence could mean either:

• The energy seller explains the tariff.
• The energy seller is explaining the tariff.

The broader context tells you which one is meant.

Because it agrees with a third-person singular subject: sprzedawca energii.

The verb wyjaśniać conjugates like this in the present tense:

• ja wyjaśniam = I explain
• ty wyjaśniasz = you explain
• on/ona/ono wyjaśnia = he/she/it explains
• my wyjaśniamy = we explain
• wy wyjaśniacie = you (plural) explain
• oni/one wyjaśniają = they explain

Since sprzedawca is singular, you get wyjaśnia.

Polish has no articles like a or the.

So Sprzedawca energii wyjaśnia taryfę can mean:

• The energy seller explains the tariff
• An energy seller explains a tariff
• The energy provider is explaining the rate plan

Which meaning is intended depends on context.

This is very normal in Polish. You usually figure out definiteness from the situation, previous sentences, or general meaning.

Yes. Polish word order is more flexible than English because case endings show grammatical roles.

The neutral order here is:

• Sprzedawca energii wyjaśnia taryfę.

But you could also say:

• Taryfę wyjaśnia sprzedawca energii.
• Wyjaśnia taryfę sprzedawca energii.

These all keep roughly the same core meaning, but the emphasis changes:

• Sprzedawca energii... puts focus on who is doing it.
• Taryfę... puts focus on what is being explained.

English usually relies more on fixed word order, while Polish can use word order for emphasis and information structure.

Yes, taryfa is a normal Polish word meaning tariff, rate, or pricing plan, especially in formal, business, transport, telecom, or energy contexts.

In the context of energy, taryfa often means a rate plan or billing tariff, for example:

• taryfa prądu = electricity tariff
• taryfa nocna = night tariff
• zmienić taryfę = change tariff / change rate plan

So in this sentence, taryfę most naturally means the pricing plan or tariff being explained to someone.

Grammatically, sprzedawca is a masculine noun. In real usage, it often refers to a male seller, but sometimes masculine forms in Polish can also be used more generally, especially in job titles or generic references.

If you want to make it clearly female, you might use:

• sprzedawczyni energii = female seller of energy

However, in business language, Polish often uses masculine job nouns quite broadly.

So depending on context, sprzedawca energii may mean:

• a male energy seller/representative
• a person in that role, with masculine grammatical wording

A rough pronunciation guide is:

Sprzedawca energii wyjaśnia taryfę
shp-sheh-DAF-tsa eh-NER-gyee vy-YASH-nya ta-RIH-fen

A few useful pronunciation notes:

• sprz is tricky for English speakers; it begins with a cluster something like shp/psh
• w in Polish sounds like English v
• j sounds like English y
• ś is a soft sh sound
• ą / ę are nasal vowels, though ę at the end of a word is often pronounced a bit more like e or en in everyday speech

You do not need to pronounce it exactly like the rough guide above, but it can help you get closer.

Here is the full breakdown:

• sprzedawca — nominative singular
  It is the subject of the sentence.

• energii — genitive singular
  It depends on sprzedawca and means of energy.

• taryfę — accusative singular
  It is the direct object of wyjaśnia.

So the structure is:

[subject] + [of-phrase] + [verb] + [direct object]

That is:

sprzedawca + energii + wyjaśnia + taryfę

Yes, but that changes the meaning.

• wyjaśnia = explains / is explaining
  present tense, from the imperfective verb wyjaśniać

• wyjaśni = will explain / explains completely depending on context
  future/simple form of the perfective verb wyjaśnić

So:

• Sprzedawca energii wyjaśnia taryfę. = The energy seller is explaining / explains the tariff.
• Sprzedawca energii wyjaśni taryfę. = The energy seller will explain the tariff.

This is a good example of how Polish uses aspect as well as tense.