Я знайшов оголошення про квартиру, і моя подруга одразу зателефонувала власниці.

Знайшов is the past tense masculine singular form of знайти (to find).

In Ukrainian, past tense verbs agree with the subject in gender and number:

• я знайшов = I found (said by a man)
• я знайшла = I found (said by a woman)
• ми знайшли = we found

So this sentence tells you that the speaker is male. Ukrainian often shows the speaker’s gender in the past tense, unlike English.

Because the subject is моя подруга (my friend, female), the verb must match it in gender.

So:

• подруга зателефонувала = the female friend called
• друг зателефонував = the male friend called

This is the same past-tense gender agreement you see in знайшов.

Because the verb зателефонувати (to call / to phone) normally takes the person called in the dative case.

So:

• власниця = owner / landlady in the nominative
• власниці = to the owner / to the landlady in the dative

That means:

• зателефонувала власниці = called the owner / called the landlady

This is very common in Ukrainian:

• подзвонити братові
• зателефонувати подрузі
• сказати вчителю

English uses a direct object here (call the owner), but Ukrainian often uses the dative with this verb.

Because the preposition про usually takes the accusative case and means about / concerning.

So:

• квартира = nominative
• квартиру = accusative

Thus:

• оголошення про квартиру = an ad/listing about an apartment

Other examples:

• книга про Україну = a book about Ukraine
• фільм про війну = a film about war

Here оголошення means an advertisement, a notice, or a listing.

In this sentence, оголошення про квартиру most naturally means something like:

• an apartment ad
• a listing for an apartment
• a notice about an apartment

Grammatically, оголошення is a neuter noun. In the singular, its nominative and accusative forms look the same, which is why you see оголошення here.

Одразу means immediately, right away, or at once.

In this sentence:

• моя подруга одразу зателефонувала власниці
• my friend immediately called the owner

Its position is fairly natural, but Ukrainian word order is flexible. You could also hear:

• моя подруга зателефонувала власниці одразу
• одразу моя подруга зателефонувала власниці

The version in the sentence sounds neutral and natural.

І means and.

It connects the two actions:

• Я знайшов оголошення про квартиру
• і моя подруга одразу зателефонувала власниці

So the whole sentence is:

• I found an apartment listing, and my friend immediately called the owner.

Ukrainian also has й, which can sometimes be used instead of і for smoother pronunciation, but і is completely normal here.

Both verbs describe completed actions:

• знайшов from знайти = found, successfully
• зателефонувала from зателефонувати = made the call, completed the action

This fits the meaning of the sentence: first the speaker found the ad, then the friend called the owner.

If you used imperfective verbs, the meaning would shift more toward process, repetition, or background:

• я знаходив = I was finding / used to find
• вона телефонувала = she was calling / she used to call / she called in a more process-focused sense

So the perfective forms are the natural choice here.

The possessive pronoun мій / моя / моє / мої must agree with the noun in gender, number, and case.

Since подруга is:

• feminine
• singular
• nominative

the correct form is моя.

Compare:

• мій друг = my male friend
• моя подруга = my female friend
• моє місто = my city
• мої друзі = my friends

Yes. Ukrainian word order is much more flexible than English word order because case endings show grammatical relationships.

The sentence as written is neutral and natural:

• Я знайшов оголошення про квартиру, і моя подруга одразу зателефонувала власниці.

But you could rearrange parts for emphasis, for example:

• Я знайшов оголошення про квартиру, і одразу моя подруга зателефонувала власниці.
• Оголошення про квартиру я знайшов, і моя подруга одразу зателефонувала власниці.

The basic meaning stays the same, but the emphasis changes. For learners, the original order is a very good standard pattern to remember.

Yes. Власниця is the female form: owner / landlady.

The male form is:

• власник = male owner / landlord

So the sentence tells you that the apartment owner is a woman.

Because the sentence uses the dative after зателефонувала, you get:

• власникові / власнику = to the male owner
• власниці = to the female owner

Usually yes, but sometimes flat may sound more natural in British English.

So:

• квартира = apartment / flat

And:

• оголошення про квартиру = ad for an apartment / ad for a flat

The Ukrainian word itself does not force American or British vocabulary; that depends on the English variety you want to use.

Ukrainian has no articles like a or the.

So a noun like власниці can mean:

• an owner
• the owner

The context tells you which is meant. Here, because it is the specific owner of the apartment from the ad, English naturally uses the owner.

The same applies to:

• оголошення = an ad / the ad
• квартиру = an apartment / the apartment

English needs articles, but Ukrainian does not.