Одержувач написав, що посилка прийде завтра, якщо мережа знову добре працюватиме.

Написав is the past tense of написати (to write, perfective).

The ending helps show:

• past tense
• singular
• masculine subject

So одержувач написав means that a male recipient wrote.

If the recipient were female, you would say:

• одержувачка написала or
• if using a feminine noun for the person, the verb would also be feminine.

In Ukrainian past tense, the verb often agrees with the subject’s gender:

• написав = masculine
• написала = feminine
• написало = neuter
• написали = plural

Прийде is future tense.

It comes from прийти (to come / to arrive), which is a perfective verb. In Ukrainian, perfective verbs do not have a true present tense. What looks like a present-tense form actually has future meaning.

So:

• прийде = will arrive

This is different from English, where the form itself is clearly marked with will. In Ukrainian, the future meaning is built into the perfective verb form.

They are different because the verbs belong to different aspects.

• прийти is perfective → прийде
• працювати is imperfective → працюватиме

In Ukrainian:

1. Perfective verbs usually form the future with simple forms:

   • прийду, прийдеш, прийде...

2. Imperfective verbs can form the future in two main ways:

   • буде працювати
   • працюватиме

So прийде means a single completed arrival, while працюватиме refers to the process/state of functioning or working.

They introduce two different kinds of subordinate clauses.

• що = that
• якщо = if

In this sentence:

• Одержувач написав, що... = The recipient wrote that...
• ..., якщо мережа... працюватиме = ..., if the network works / will be working...

So the structure is:

• main clause: Одержувач написав
• content clause: що посилка прийде завтра
• conditional clause: якщо мережа знову добре працюватиме

That is a very common question for English speakers.

In Ukrainian, it is normal to use the future tense after якщо when the condition is about the future:

• якщо мережа працюватиме = if the network works / will be working

English usually prefers the present after if:

• If the network works well, the package will arrive

But Ukrainian often uses future in both parts when both actions are in the future:

• посилка прийде, якщо мережа працюватиме

So this is a normal Ukrainian pattern, not a mistake.

All three are in the nominative case, because each one is the subject of its own clause.

• Одержувач написав
  Одержувач is the subject of написав

• що посилка прийде завтра
  Посилка is the subject of прийде

• якщо мережа знову добре працюватиме
  Мережа is the subject of працюватиме

So even though this is one whole sentence, it contains multiple clauses, and each clause has its own subject in the nominative.

Because добре is an adverb, and it modifies the verb працюватиме.

It describes how the network will function:

• добре працюватиме = will work well

An adjective like добрий / добра / добре would describe a noun, not a verb.

Compare:

• добра мережа = a good network
  here добра describes мережа
• мережа добре працюватиме = the network will work well
  here добре describes працюватиме

Yes, here знову means again.

So:

• мережа знову добре працюватиме = the network will work well again

It suggests that the network was working well before, then there was some problem, and now the speaker hopes it will return to normal.

A near-synonym is знов, which is a shorter variant. In many contexts, знову and знов are interchangeable.

Yes. Both are possible.

• мережа добре працюватиме
• мережа буде добре працювати

Both mean roughly the network will work well.

The form працюватиме is the synthetic future, and буде працювати is the analytic future of an imperfective verb.

In many contexts they are very close in meaning. The shorter synthetic form often sounds a bit more compact or formal in writing, but both are standard.

Ukrainian word order is fairly flexible, and different orders can be correct.

The sentence uses a neutral, natural order:

• посилка прийде завтра

But these are also possible:

• завтра посилка прийде
• посилка завтра прийде

The difference is usually about focus or emphasis, not basic grammar.

For example:

• посилка прийде завтра = neutral statement
• завтра посилка прийде = stronger focus on tomorrow
• посилка завтра прийде = often conversational, with some emphasis on the time

So the original order is just a natural default.

Yes, both одержувач and отримувач can mean recipient.

A few notes:

• одержувач is fully correct and common in formal or administrative language.
• отримувач is also very common and often feels more natural to many speakers in modern usage.

In many situations, they are interchangeable:

• одержувач посилки
• отримувач посилки

Both mean the recipient of the package.

Because Ukrainian normally uses commas to separate subordinate clauses.

Here:

• Одержувач написав, що...
• ..., якщо мережа...

So the commas mark the boundaries between:

1. the main clause
2. the that-clause
3. the if-clause

This punctuation is standard in Ukrainian and is often more regular than in English.

It means that the package arrives tomorrow, not that the writing happened tomorrow.

The adverb завтра belongs naturally to the clause:

• що посилка прийде завтра

So it modifies прийде:

• прийде завтра = will arrive tomorrow

The main verb написав is already in the past, so the writing happened before the moment of speaking.

It has three layers:

1. Main clause
   Одержувач написав
   = The recipient wrote

2. Content clause introduced by що
   що посилка прийде завтра
   = that the package will arrive tomorrow

3. Conditional clause introduced by якщо
   якщо мережа знову добре працюватиме
   = if the network works well again

So the full logic is:

• someone wrote
• the content of what they wrote is that the package will arrive tomorrow
• that arrival depends on the condition about the network functioning well again

This kind of nested structure is very common in Ukrainian.