Subskrypcja jest droga.

Because droga has to agree with subskrypcja.

Subskrypcja is:

• feminine
• singular
• nominative

So the adjective also takes the feminine singular nominative form: droga.

Compare:

• drogi abonament — masculine
• droga subskrypcja — feminine
• drogie konto — neuter

It is in the nominative case because it is the subject of the sentence.

The structure is:

• Subskrypcja — subject
• jest — is
• droga — predicate adjective

So this is a very basic X is Y sentence, and the subject stays in the nominative.

Yes, in normal Polish you do.

Polish usually does not omit the present-tense verb to be in ordinary sentences like this. So:

• Subskrypcja jest droga. — normal
• Subskrypcja droga. — not standard as a full neutral sentence

You might sometimes see the verb left out in:

• headlines
• notes
• very informal speech
• poetic style

But for standard Polish, keep jest.

Because Polish has no articles.

So subskrypcja can mean:

• a subscription
• the subscription

The exact meaning depends on context.

If you want to make it more specific, Polish often uses words like:

• ta subskrypcja — this subscription
• jakaś subskrypcja — some subscription

Yes. Droga can mean different things depending on grammar and context.

It can be:

• droga = expensive (feminine form of the adjective drogi)
• droga = road / way (a noun)

So in this sentence, jest droga clearly means is expensive, because droga is functioning as an adjective describing subskrypcja.

Also, forms of drogi can mean dear in the sense of beloved or in greetings like Dear Anna, but that is a different use.

A rough guide is:

soob-SKRIP-tsya yest DRO-gah

A few details:

• subskrypcja → stress on SKRIP
• jest → sounds like yest
• droga → stress on DRO

Useful pronunciation notes:

• Polish stress is usually on the second-to-last syllable
• j sounds like English y
• c sounds like ts
• rz is not in this sentence, but r in Polish is usually trilled or tapped more than in English
• y in subskrypcja has no exact English equivalent

Yes, but Subskrypcja jest droga is the most neutral word order.

Polish word order is more flexible than English because endings carry a lot of grammatical information. Still, changing the order usually changes the focus or emphasis.

For example:

• Subskrypcja jest droga. — neutral
• Droga jest subskrypcja. — unusual, marked, not the normal everyday order

So for learners, the standard version is the best one to use.

Yes, but it means something slightly different grammatically.

• Subskrypcja jest droga. — The subscription is expensive.
• droga subskrypcja — an expensive subscription

In droga subskrypcja, the adjective directly modifies the noun inside a noun phrase.

In Subskrypcja jest droga, the adjective comes after jest because it is part of the predicate.

Subskrypcja is a real and common word, especially for things like:

• streaming services
• newsletters
• online platforms
• software services

But in some contexts Polish speakers may also use abonament.

Very roughly:

• subskrypcja = subscription
• abonament = subscription plan / recurring service fee

Examples:

• subskrypcja newslettera
• abonament telefoniczny
• abonament na internet

There is some overlap, but subskrypcja sounds very natural in many modern digital contexts.