Podemos supor que o resultado esteja correto.

Because this sentence presents the result as an assumption, not as a confirmed fact.

• está = indicative mood, used for statements treated as real or factual
• esteja = subjunctive mood, used for uncertainty, hypothesis, possibility, doubt, or non-factual ideas

In Podemos supor que o resultado esteja correto, the idea is basically:

• We can suppose / assume that the result may be correct

So Portuguese often uses the subjunctive after expressions that introduce uncertainty or conjecture.

Esteja is the present subjunctive of estar.

Here is the full present subjunctive of estar:

• eu esteja
• você/ele/ela esteja
• nós estejamos
• vocês/eles/elas estejam

In your sentence, the subject is o resultado, which is third person singular, so the form is esteja.

Yes, you may hear that, and many native speakers would understand it perfectly. But the nuance changes.

• ...esteja correto sounds more careful, tentative, and grammatically aligned with the idea of hypothesis.
• ...está correto sounds more like the speaker is leaning toward treating it as true.

So:

• Podemos supor que o resultado esteja correto = We may assume the result is correct / Let us suppose the result is correct
• Podemos supor que o resultado está correto = more like We can assume the result is correct with stronger factual flavor

In formal writing, esteja is often the better choice here.

Because supor can introduce something hypothetical rather than something known.

In Portuguese, the subjunctive is common after verbs or expressions that suggest:

• doubt
• possibility
• assumption
• uncertainty
• non-established facts

So supor que often invites the subjunctive when the speaker means let us assume / suppose hypothetically that...

Compare:

• Suponho que ele esteja em casa.
  = I suppose he may be at home.
• Acho que ele está em casa.
  = I think he is at home.

The first sounds more hypothetical; the second more like a personal belief about reality.

Literally, it means we can suppose.

Breakdown:

• podemos = we can
• supor = to suppose / assume

So the sentence starts with something like:

• We can suppose that...
• We may assume that...

Depending on context, it can also sound like:

• Let’s assume that...

That is a very natural English equivalent, even though vamos supor is even closer to let’s suppose.

Que here means that and introduces the subordinate clause.

Structure:

• Podemos supor = main clause
• que o resultado esteja correto = subordinate clause

So the pattern is:

• [main clause] + que + [another clause]

Very common in Portuguese:

• Acho que ele vem. = I think that he is coming.
• É possível que chova. = It’s possible that it will rain.
• Podemos supor que o resultado esteja correto.

In English, that is often optional. In Portuguese, que is normally required.

Because correto is an adjective, and it describes o resultado.

• o resultado está correto = the result is correct

By contrast, corretamente is an adverb, meaning correctly, and it would describe how something is done:

• Ele calculou corretamente. = He calculated correctly.

So here you need the adjective correto, because you are describing the state of the result, not the manner of an action.

The subject is o resultado.

So the subordinate clause is:

• que o resultado esteja correto

And inside that clause:

• o resultado = subject
• esteja = verb
• correto = predicate adjective describing the subject

Portuguese often does not need an extra subject pronoun like ele here, because o resultado already names the subject clearly.

In this sentence, o resultado means the result, referring to a specific result.

Portuguese uses definite articles very naturally in places where English also uses the:

• o resultado = the result

Without the article, resultado would sound less natural here unless it were part of a different structure, such as:

• Resultado correto é importante.
  = A correct result is important.
  (more abstract or generic)

But in your sentence, you are talking about a particular result, so o resultado is the normal form.

Usually, esteja correto is the more natural choice here.

Why?

• estar correto often refers to being correct in a specific situation, conclusion, answer, or result
• ser correto can sound more like being inherently correct, proper, or morally right, depending on context

With resultado, Portuguese strongly prefers:

• o resultado está correto

So in this sentence:

• que o resultado esteja correto = that the result be / may be correct

That is the standard phrasing.

A very natural translation would be one of these:

• We can assume that the result is correct.
• We may suppose that the result is correct.
• Let’s assume that the result is correct. (depending on context)

The Portuguese sentence is slightly formal and careful because of the subjunctive esteja, so translations with assume, suppose, or may be often capture the tone best.

Yes, it sounds somewhat formal or academic, especially because of supor and the subjunctive esteja.

In more everyday spoken Brazilian Portuguese, people might say things like:

• A gente pode supor que o resultado está correto.
• Dá para supor que o resultado está correto.
• Podemos assumir que o resultado está correto.

But your original sentence is absolutely natural, especially in writing, technical discussion, or formal explanation.

A rough pronunciation is:

• es-TE-zha

More approximately in IPA: /isˈtɛ.ʒɐ/ in many Brazilian accents.

A few helpful notes:

• the j sound in esteja is like the s in measure
• the final a is usually light and unstressed
• in many Brazilian accents, the initial e sounds closer to i in connected speech, so it may sound a bit like is-TE-zha

So the whole sentence is approximately:

• po-DE-mus su-POR ki u re-zul-TA-du is-TE-zha ko-RE-tu

That is only an approximation, but it can help with first reading.