Сначала нужно проверить выписку.

Нужно is an impersonal word meaning it is necessary / one needs to. In this sentence, it does not say who has to do the action. It simply states a general necessity:

• Сначала нужно проверить выписку. = First, it’s necessary to check the statement/document.

A few comparisons:

• нужно = neutral, common, often used in instructions or explanations
• надо = very similar, often slightly more conversational
• я должен / ты должен / он должен = names a specific person and can sound stronger or more personal

So this sentence is natural if the speaker means the first step is to check the document, without focusing on who does it.

Проверить is the perfective form, while проверять is imperfective.

Here, проверить is used because the sentence refers to a single completed action: check the document and finish checking it.

• проверить = to check, to verify once / completely
• проверять = to be checking / to check regularly / repeatedly / as a process

So:

• Сначала нужно проверить выписку. = First, you need to check it (complete the check).

If you said проверять, it would sound less natural here unless you meant something habitual or ongoing.

Because выписку is in the accusative case, which is the case usually used for the direct object of a verb.

The verb проверить takes a direct object: you check something. Here, that something is выписка.

• Nominative: выписка
• Accusative: выписку

Since выписка is a feminine noun ending in -а, its accusative singular changes to -у:

• выписка → выписку

So the structure is:

• проверить что? → выписку

Сначала means at first, first, or to begin with.

It is often placed at the beginning of the sentence because it sets the order of actions:

• Сначала нужно проверить выписку. = First, you need to check the document.

This tells the listener that checking the document is the first step.

Russian word order is flexible, so other placements are possible, but starting with сначала is very natural when giving instructions or sequencing tasks.

Yes, in a way. The sentence does not explicitly name the person who must do the action.

That is very common in Russian with нужно + infinitive. The meaning is something like:

• someone needs to check it
• it needs to be checked first
• we/you/I need to check it first

Who exactly is responsible depends on the context.

This makes the sentence useful in general instructions, office situations, medical situations, or explanations of procedure.

Yes, Russian word order is flexible, although some versions sound more natural than others depending on emphasis.

Standard neutral order:

• Сначала нужно проверить выписку.

Possible variations:

• Выписку сначала нужно проверить.
  This puts more emphasis on выписку.
• Нужно сначала проверить выписку.
  Also very natural; slightly shifts focus toward the action.

The original version is a very normal neutral way to say it.

No, выписка can mean different things depending on context. Common meanings include:

• a statement or extract from records
• a bank statement
• an official extract from a document or register
• in medical contexts, a discharge note or medical summary

So in this sentence, the exact translation of выписку depends on the situation. Grammatically, though, it works the same way.

Yes. In most everyday contexts, нужно and надо are very close in meaning.

• Сначала нужно проверить выписку.
• Сначала надо проверить выписку.

Both are natural. Very roughly:

• нужно can sound a bit more neutral or formal
• надо can sound a bit more conversational

But in many situations, the difference is small.

It is fairly neutral. It is not strongly formal, but it fits well in formal settings too.

Because it uses:

• нужно = neutral, practical
• an infinitive construction = common in instructions
• no personal subject = impersonal and objective

It could appear in:

• office instructions
• medical instructions
• procedural explanations
• everyday conversation

So it is best described as neutral and standard.

The main stress is:

• Снача́ла ну́жно прове́рить выпи́ску.

Stress by word:

• снача́ла
• ну́жно
• прове́рить
• выпи́ску

Stress is important in Russian because it is not always predictable, so it is worth learning words together with their stress.

Yes, that is a very natural English translation.

Russian often uses an impersonal construction where English may use either:

• You need to check the statement first
• First, it’s necessary to check the statement
• The statement needs to be checked first

All of these can match Сначала нужно проверить выписку, depending on style and context. The Russian sentence itself does not force one exact English structure.

Because Russian infinitives do not use a separate word like English to.

In English:

• to check

In Russian:

• проверить

The ending of the verb itself shows that it is an infinitive. So after нужно, Russian simply uses the infinitive directly:

• нужно проверить = need to check / it is necessary to check