Его талант заметили сразу.

Yes, его can mean either:

• him as a pronoun form
• his as a possessive

In его талант, it means his because it directly modifies the noun талант.

So:

• его талант = his talent
• Я вижу его = I see him

A useful clue is position and function:

• before a noun → often his
• standing alone as the object of a verb → often him

Also, possessive его does not change by case, gender, or number:

• его талант
• его книга
• его друзья

It always stays его.

It is in the accusative here, but for an inanimate masculine noun, the accusative looks exactly like the nominative.

So:

• nominative: талант
• accusative: талант

That means in this sentence талант is the direct object of заметили, even though its form looks unchanged.

Compare:

• Я вижу стол → стол is accusative, but it looks like nominative
• Я вижу брата → animate masculine, so accusative changes to брата

So in Его талант заметили сразу, талант is the thing that was noticed.

Russian often uses 3rd person plural with no subject to mean people, they, or someone in a general sense.

So заметили literally means they noticed, but the sentence does not specify who they are.

This is a very common Russian pattern. It often translates naturally into English as:

• His talent was noticed right away
• People noticed his talent right away

So the sentence is active in Russian form, but often passive in English translation.

Because the hidden subject is understood as they in a general, indefinite sense.

Russian uses this structure a lot:

• Говорят, что... = They say that... / It is said that...
• Меня спросили... = They asked me... / I was asked...
• Его талант заметили сразу. = They noticed his talent right away.

The verb is plural because the implied subject is plural.

Заметили is the perfective past form of заметить. It shows a completed event: at some point, people noticed his talent.

So this sentence presents the noticing as a single whole fact.

Compare:

• заметили = noticed, did notice, came to notice
• замечали = were noticing, used to notice, noticed repeatedly

If you said Его талант замечали сразу, it would sound unusual in most contexts, because сразу suggests one clear moment or immediate result, which fits perfective заметили much better.

Сразу means immediately, right away, or at once.

In this sentence, it tells you how quickly people noticed his talent.

Examples:

• Я сразу понял. = I understood immediately.
• Она сразу ответила. = She answered right away.

So Его талант заметили сразу means his talent did not go unnoticed for long.

Yes, Russian word order is flexible. This version sounds natural and neutral, with a slight focus on his talent as the topic.

Other possible orders include:

• Сразу заметили его талант.
• Его талант сразу заметили.

These all mean roughly the same thing, but the emphasis shifts a bit.

Very roughly:

• Его талант заметили сразу → starts with his talent
• Сразу заметили его талант → stronger emphasis on immediately
• Его талант сразу заметили → balanced, with сразу placed closer to the verb

Russian word order often helps manage emphasis rather than changing the core meaning.

Yes, but it would usually sound more formal or bookish.

Possible passive version:

• Его талант был сразу замечен.

This is grammatical and means the same thing, but Russian often prefers the active indefinite-personal structure:

• Его талант заметили сразу.

That active structure is usually more natural in everyday Russian.

So English may prefer:

• His talent was noticed right away

while Russian often prefers:

• They noticed his talent right away

even when no specific they is meant.

The stress is:

• его́ or often unstressed in running speech
• тала́нт
• заме́тили
• сра́зу

A practical pronunciation guide:

• его талант заметили сразу
• roughly: yivo ta-LANT za-MYE-ti-li SRA-zu

A few notes:

• е in его is pronounced like yi at the start
• г in его is often pronounced more like v in modern standard pronunciation, so его sounds close to иво / йиво
• заметили has stress on ме́
• сразу has stress on the first syllable

Его талант is correct here because it means his talent referring to some other male person.

Свой is used when the possessor is the same as the subject of the clause.

For example:

• Он показал свой талант. = He showed his own talent.
• Его талант заметили сразу. = His talent was noticed right away.

In your sentence, there is no explicit subject like он, and the hidden subject is the indefinite they/people, so свой would not fit naturally. Его is the right choice.

The infinitive is заметить.

This is a perfective verb. Some useful forms:

• заметить = to notice
• заметил = noticed, masculine singular
• заметила = noticed, feminine singular
• заметило = noticed, neuter singular
• заметили = noticed, plural

Its imperfective partner is замечать:

• замечать = to notice, to be noticing, to notice regularly
• замечал / замечала / замечали

So the pair is:

• замечать → imperfective
• заметить → perfective

That pair is very useful to remember.