Все заметили красоту старого здания.

Here it means everyone.

In Russian, все can mean either everyone or everything, depending on context. In this sentence, the verb заметили is plural and refers to people noticing something, so все is understood as everyone.

So:

• Все заметили... = Everyone noticed...

If it meant everything, the rest of the sentence would normally make that clear from context.

Заметили is the past tense plural form of the verb заметить, which means to notice.

Breakdown:

• заметить = to notice
• заметил = he noticed
• заметила = she noticed
• заметило = it noticed
• заметили = they noticed

Because все means everyone, Russian uses the plural verb form: заметили.

Also, заметить is a perfective verb, so it suggests a completed action: they noticed it.

Because красоту is in the accusative case, which is used for the direct object of the verb.

Here, the thing that everyone noticed is the beauty, so beauty is the direct object:

• красота = beauty (nominative, dictionary form)
• красоту = beauty (accusative singular)

So:

• Все заметили красоту... = Everyone noticed the beauty...

This is very common in Russian: the direct object changes form depending on its case.

Because старого здания means of the old building, and after a noun like красота (beauty), Russian often uses the genitive case to show possession or relation.

So:

• красота здания = the beauty of the building
• красота старого здания = the beauty of the old building

Both words are in the genitive singular:

• здание → здания
• старое → старого

The adjective старого matches the noun здания in case, number, and gender.

Good question. Старого здания is not the direct object here, so it is not in the accusative.

The direct object is only:

• красоту = beauty

Then старого здания depends on красоту and means of the old building, so it is in the genitive, not the accusative.

The animate/inanimate accusative rule does not apply here because здание is not acting as the object of the verb.

Not exactly. Заметить means to notice, to spot, or to become aware of something.

So this sentence is not just saying that people saw the building. It says they noticed the beauty of the old building.

Compare:

• видеть = to see
• заметить = to notice

So заметили красоту is closer to:

• noticed the beauty
• became aware of the beauty
• took note of the beauty

Yes. Russian word order is more flexible than English word order because case endings show the grammatical roles.

The neutral word order here is:

• Все заметили красоту старого здания.

But you could also say:

• Красоту старого здания заметили все.

This still means the same basic thing, but the emphasis changes. That version puts more focus on the beauty of the old building and then adds everyone at the end for emphasis.

So word order in Russian often affects focus or style, not just grammar.

Russian has no articles, so there is no direct equivalent of the or a/an.

That means:

• красоту старого здания can mean the beauty of the old building
• or, depending on context, a beauty of an old building would be theoretically possible, though in this sentence the beauty of the old building is the natural English translation

Russian relies on context, word order, and meaning rather than articles.

Because здания is the genitive singular form of здание.

Dictionary form:

• здание = building

Genitive singular:

• здания = of the building

In this sentence, it follows красоту and answers the question whose beauty? / beauty of what?

• красоту чего? = beauty of what?
• старого здания = of the old building

So the ending helps show the relationship.

The main stress pattern is:

• Все́ заме́тили красоту́ ста́рого зда́ния

A rough pronunciation guide:

• все = fse
• заметили = za-MYE-ti-li
• красоту = kra-sa-TU
• старого = STA-ra-va
• здания = ZDA-ni-ya

A few notes:

• все is pronounced more like fsyo/fse, depending on how you represent it for English speakers
• the unstressed о in старого sounds closer to a
• г in -ого is often pronounced like v in standard speech, so старого sounds like старова

Yes, it is completely natural.

It is a normal, grammatically standard sentence meaning:

• Everyone noticed the beauty of the old building.

It uses very common patterns:

• все
  • plural past verb
• a direct object in the accusative
• a related noun phrase in the genitive

So it is a good example of everyday written and spoken Russian.