Не перевірили ні розрахунковий період, ні абонентську плату.

Ukrainian often omits the subject when it is clear from context or not important.

So Не перевірили... literally means something like:

• did not check...
• they didn’t check...
• someone didn’t check...
• in some contexts, even you (plural/formal) didn’t check...

The verb form перевірили tells you it is past tense plural, but by itself it does not specify exactly who the subject is. English usually wants a subject, but Ukrainian often leaves it out.

Перевірили is the past tense plural form of перевірити (to check, to verify).

That plural form can refer to:

• they checked
• you checked (plural or polite/formal you)

With не, it becomes did not check.

Because there is no explicit subject, the sentence leaves open who exactly failed to check those things. The context would normally tell you.

This is the standard Ukrainian pattern for neither ... nor ... together with negation.

In this sentence:

• не перевірили = did not check
• ні розрахунковий період, ні абонентську плату = neither the billing period nor the subscription fee

So the structure is:

• не + verb + ні X, ні Y

This is very common in Ukrainian.
A useful pattern to remember is:

• Я не бачив ні Олега, ні Марію. = I saw neither Oleh nor Mariia.
• Вони не купили ні хліба, ні молока. = They bought neither bread nor milk.

So ні ... ні ... works with the negative verb, not by itself.

Because both nouns are in the accusative case, but they belong to different grammatical types.

They are the direct objects of перевірили (checked), so accusative is required.

1. розрахунковий період

   • період is a masculine inanimate noun
   • for masculine inanimate nouns, the accusative usually looks like the nominative
   • so:
     • nominative: розрахунковий період
     • accusative: розрахунковий період

2. абонентська плата

   • плата is a feminine noun
   • feminine nouns in -а usually change to -у / -ю in the accusative
   • so:
     • nominative: абонентська плата
     • accusative: абонентську плату

That is why the adjective changes too:

• абонентська → абонентську
• розрахунковий stays розрахунковий because masculine inanimate accusative matches nominative

Because after the verb перевірили, the phrase is a direct object, so it must be in the accusative case.

The dictionary form is:

• абонентська плата

But in the accusative:

• абонентську плату

Both words change because the adjective must agree with the noun in gender, number, and case.

So:

• nominative: абонентська плата
• accusative: абонентську плату

Розрахунковий період is a set phrase often used in administrative, billing, utility, legal, or financial contexts.

Depending on context, it can mean:

• billing period
• calculation period
• accounting period
• settlement period

A native English speaker will often find billing period the most natural in many everyday service contexts, but the exact English wording depends on what kind of document or system this is.

Абонентська плата usually means a regular fee paid for access to a service.

Possible English equivalents include:

• subscription fee
• monthly fee
• service fee
• subscriber fee

The best translation depends on context. For example:

• phone/internet service: often subscription fee or monthly fee
• utilities or service contracts: sometimes service charge

So the Ukrainian phrase is broad enough to cover several similar English terms.

Перевірили comes from перевірити, which is perfective.

That means the sentence presents the checking as a completed action that did not happen:

• They did not check it
• They failed to check it

The imperfective partner is перевіряти. In the past plural negative, that would be не перевіряли.

The difference is roughly:

• не перевірили = didn’t check / failed to check as a completed expected action
• не перевіряли = weren’t checking / didn’t check in a more ongoing, repeated, or process-focused sense

In your sentence, не перевірили sounds very natural if the speaker means that the expected verification was not carried out.

Yes, Ukrainian word order is fairly flexible, though the original order is very natural and neutral:

• Не перевірили ні розрахунковий період, ні абонентську плату.

This puts the focus first on the fact that the checking was not done, and then lists the things that were not checked.

You may also see other orders for emphasis, but not all are equally neutral. For learners, the original structure is a very good model to follow.

Ukrainian has no articles.

So nouns like період or плата do not have separate words corresponding to a/an/the. Whether something is definite or indefinite is understood from:

• context
• word order
• general meaning
• sometimes intonation

That is why a Ukrainian sentence can correspond to different English versions, such as:

• the billing period
• a billing period

depending on context.

Yes. The Ukrainian sentence is active in form, but English often prefers a passive rendering in formal or administrative contexts.

So depending on style, you might express it as either:

• They didn’t check either the billing period or the subscription fee.
• Neither the billing period nor the subscription fee was checked.

Both can represent the same Ukrainian sentence. Ukrainian does not force you to make that active/passive choice in the same way English often does.

No. They are related to negation, but they do different jobs.

• не is the main negative particle used with verbs:

  • не перевірили = did not check

• ні is used in negative constructions like:

  • ні ... ні ... = neither ... nor ...
  • or in words such as ніхто (nobody), ніщо (nothing)

So in this sentence:

• не negates the verb
• ні ... ні ... links the two items under that negation

A useful way to remember it is:

• не = basic negation
• ні = negative connector or negative element within a larger negative structure