Вона кладе документи в конверт і пише адресу одержувача.

Ukrainian does not have articles. There is no separate word for a/an or the. Whether a noun is definite or indefinite is understood from context.

So в конверт can mean into an envelope or into the envelope, depending on the situation.

Here документи is in the accusative plural, because it is the direct object of кладе.

The reason it looks unchanged is that for many inanimate masculine nouns, the accusative plural is identical to the nominative plural.

• nominative plural: документи
• accusative plural: документи

So the form stays the same, even though the case changes.

Because в can mean either in or into, depending on the case that follows it.

• в + accusative = movement/direction, so into
• в + locative = location, so in

In this sentence, the documents are being put into the envelope, so Ukrainian uses в конверт.

Compare:

• кладе документи в конверт = puts the documents into the envelope
• документи в конверті = the documents are in the envelope

Because адресу is the accusative singular form of адреса.

It is the direct object of пише, so it must be in the accusative:

• dictionary form: адреса
• accusative singular: адресу

This is a normal pattern for many feminine nouns ending in -а.

Одержувача is genitive singular.

After another noun, the genitive often shows a relationship like English of or 's. So:

• адреса одержувача = the address of the recipient
• in more natural English: the recipient's address

The base form is одержувач.

Yes. Кладе is the 3rd person singular present tense of класти.

It means:

• she puts
• or she is putting

Ukrainian present tense often covers both English simple present and present continuous, so context decides which English translation sounds best.

Also, this verb has a stem change in the present tense:

• класти = to put, to lay
• я кладу
• ти кладеш
• вона кладе

Because покладе comes from the perfective verb покласти, and that form normally means she will put, not she is putting.

In Ukrainian:

• класти = imperfective, used for ongoing/repeated action
• покласти = perfective, used for a completed single action

So in a present-time description like this one, кладе is the natural choice.

Yes. Just like кладе, пише is present tense and can be translated either way depending on context:

• she writes
• she is writing

The verb is from писати = to write.

So the whole sentence can describe either:

• what she is doing right now, or
• a habitual/action-description type of situation

Yes, very often.

Ukrainian frequently leaves out subject pronouns when the subject is already clear from context. So this would also be natural:

• Кладе документи в конверт і пише адресу одержувача.

However, вона is still perfectly normal if you want to make the subject explicit, contrast her with someone else, or simply make the sentence clearer.

No. Ukrainian word order is much more flexible than English word order.

The sentence as given is a neutral, natural version:

• Вона кладе документи в конверт і пише адресу одержувача.

But other orders are possible if you want to emphasize something:

• Документи вона кладе в конверт... = emphasis on documents
• Адресу одержувача вона пише... = emphasis on the recipient's address

The case endings help show what each word is doing, so word order does not carry as much grammatical weight as it does in English.

Yes, all three can mean and:

• і
• й
• та

The choice is often about euphony—what sounds smoother in context.

In this sentence, і is the natural standard choice:

• в конверт і пише

You may see й in places where it helps the flow of pronunciation, and та is also common, though sometimes a bit more literary or stylistically different.

So here і is simply the most straightforward option.

It is closest to recipient or receiver—the person who receives something.

In postal or formal address contexts, you may also see:

• адресат = addressee
• отримувач = recipient

So адреса одержувача is correct and understandable, but depending on context you might also encounter:

• адреса адресата
• адреса отримувача