Акт приёмки описывает скрытые работы.

In this context, акт is a formal/documentary word, not a theatrical or legal act in the usual English sense.

Here it means something like:

• report
• certificate
• official record
• formal document

So акт приёмки is a set phrase meaning an acceptance certificate/report or acceptance record, especially in technical, legal, or construction contexts.

Because приёмки is in the genitive singular.

Russian often uses this pattern:

• noun + genitive noun

to express relationships that English often translates with of.

So:

• акт = document/report
• приёмка = acceptance
• акт приёмки = acceptance report / report of acceptance

This is very common in Russian:

• чашка чая = cup of tea
• центр города = city center / center of the city
• акт приёмки = act/report of acceptance

Yes. In real Russian texts, ё is often written as е.

So both of these may appear:

• приёмки
• приемки

But the pronunciation is still yo, not plain e.

For learners, it is very helpful when ё is written, because it shows both:

• the correct pronunciation
• the correct stress

So приёмки is pronounced roughly pri-YOM-ki.

It is in the accusative plural because it is the direct object of описывает.

The verb описывать / описать takes a direct object:

• описывать что? = to describe what?

So:

• описывает скрытые работы = describes hidden works

Why does it look the same as the nominative plural?

Because работы is inanimate, and for inanimate plural nouns, the accusative plural usually looks the same as the nominative plural.

So:

• nominative plural: скрытые работы
• accusative plural: скрытые работы

Same form, different function.

In English, work is often uncountable, but in Russian работа / работы can mean:

• work
• tasks
• operations
• types of work
• construction work items

In technical and construction language, работы is very commonly used in the plural to mean work carried out, operations, or construction works.

So скрытые работы is a standard technical expression meaning something like:

• hidden works
• concealed works
• work that will later be covered up and cannot be inspected visually

So the plural sounds natural in Russian, even if English might prefer something like hidden work in some contexts.

This is a technical construction term.

Скрытые работы are works that later become covered by other construction stages, so they are no longer visible for easy inspection.

Examples might include:

• reinforcement before concrete is poured
• waterproofing before finishing layers are added
• wiring or pipes inside walls

So скрытые here does not mean secret in the everyday sense. It means concealed, covered up, or not visible after completion.

Because the subject is акт, which is singular.

Breakdown:

• акт = singular masculine noun
• описывает = he/she/it describes or describes in 3rd person singular

So grammatically, the sentence is:

• Акт = subject
• описывает = verb
• скрытые работы = object

Since акт is singular, the verb must also be singular.

Not necessarily.

Russian present tense is often used for:

• general statements
• definitions
• descriptions of what something does
• official or technical wording

So Акт приёмки описывает скрытые работы can mean something like:

• The acceptance report describes the hidden works.
• The acceptance report is used to describe the hidden works.
• The acceptance report contains a description of the hidden works.

It does not have to mean someone is describing them at this exact moment.

The verb here belongs to the aspect pair:

• описывать = imperfective
• описать = perfective

Here, описывает is the imperfective present-tense form.

Why use imperfective here?

Because the sentence states the function or content of the document in a general way. It is not emphasizing one completed act of description, but rather what the document does.

Compare:

• Акт описывает скрытые работы.
  = The report describes hidden works. / The report contains a description of hidden works.

• Акт описал скрытые работы.
  = The report described the hidden works.
  This sounds more like a completed past event.

Yes, Russian word order is flexible because case endings show grammatical roles.

The neutral order here is:

• Акт приёмки описывает скрытые работы.

This is the most straightforward subject + verb + object order.

But you could rearrange it for emphasis, for example:

• Скрытые работы описывает акт приёмки.

That still means the same basic thing, but it puts more focus on скрытые работы.

Even so, the original order is the most natural if you are simply stating information plainly.

Yes, very much so.

It is a common official/technical phrase, especially in construction, engineering, inspection, and legal-administrative contexts.

Learners should treat it almost like a unit:

• акт приёмки = acceptance certificate / acceptance report

In real life, you may also see longer versions, such as:

• акт приёмки работ = acceptance report for the work
• акт освидетельствования скрытых работ = certificate/report of inspection of concealed works

So the sentence sounds formal and technical, not conversational.

Russian does not have articles.

So Акт приёмки can mean:

• the acceptance report
• an acceptance report
• sometimes simply acceptance report

The exact meaning depends on context.

English requires articles, but Russian usually relies on:

• context
• word order
• emphasis
• the situation being discussed

So when translating, you choose a or the based on context, not because the Russian sentence explicitly shows it.

A helpful stress-marked version is:

Акт приёмки опи́сывает скры́тые рабо́ты.

Approximate pronunciation:

• Акт = ahkt
• приёмки = pri-YOM-ki
• описывает = a-PEE-sy-vyet
• скрытые = SKRY-ty-ye
• работы = ra-BO-ty

A rough full pronunciation guide:

ahkt pri-YOM-ki a-PEE-sy-vyet SKRY-ty-ye ra-BO-ty

Not in this sentence.

Although скрытый can sometimes mean hidden in a general sense, in technical language скрытые работы is a standard term for concealed works.

If you wanted to say secret work in an everyday sense, this phrase would usually not be the natural choice.

So here скрытые is best understood as:

• concealed
• covered
• hidden from later inspection

not secret.