A não ser que o professor peça outro texto, eu não vou reescrever a conclusão.

Yes. A não ser que is a fixed expression that means unless.

It is made up of:

• a
• não
• ser
• que

But learners should usually treat the whole thing as one chunk: a não ser que = unless.

Example:

• A não ser que chova, vamos sair.
  = Unless it rains, we’re going out.

In everyday Brazilian Portuguese, this expression is very common.

Because a não ser que requires the subjunctive.

So:

• o professor pede = the professor asks/requests
• o professor peça = that the professor ask/request

After expressions like a não ser que, Portuguese uses the subjunctive because the action is uncertain, hypothetical, or conditional.

So:

• A não ser que o professor peça... = Unless the professor asks...

Using pede here would sound wrong in standard Portuguese.

Peça comes from the verb pedir, which means to ask for or to request.

Its present subjunctive forms are irregular:

• eu peça
• você/ele/ela peça
• nós peçamos
• vocês/eles/elas peçam

So in this sentence:

• o professor peça = the professor asks/request

Notice the spelling change:

• infinitive: pedir
• subjunctive stem/form: peça

This is just something you have to learn as part of the verb’s conjugation.

Even though peça is in the present subjunctive, in this sentence it usually refers to a future possibility.

That is very common in Portuguese.

So:

• A não ser que o professor peça outro texto...

means something like:

• unless the professor asks for another text
• unless the professor does ask / ends up asking for another text

In context, it is not about a habitual present action. It is about a possible future condition.

Yes, they are very close in meaning. Both usually mean unless and both are followed by the subjunctive.

So you could also say:

• A menos que o professor peça outro texto, eu não vou reescrever a conclusão.

That would sound natural too.

If there is any difference, it is usually very small and contextual. For most learners, you can treat them as equivalents.

Because the sentence begins with a subordinate clause:

• A não ser que o professor peça outro texto

Then comes the main clause:

• eu não vou reescrever a conclusão

In Portuguese, when this kind of introductory clause comes first, it is very normal to separate it with a comma.

You could reverse the order:

• Eu não vou reescrever a conclusão, a não ser que o professor peça outro texto.

That is also natural.

Both are possible, but eu não vou reescrever is much more common in everyday Brazilian Portuguese.

Compare:

• eu não vou reescrever = I’m not going to rewrite
• não reescreverei = I will not rewrite

The simple future (reescreverei) is grammatical, but it often sounds more formal, literary, or emphatic. In spoken Brazilian Portuguese, the structure ir + infinitive is usually preferred.

So this sentence sounds natural and conversational.

Yes, it could be omitted.

Portuguese often drops subject pronouns when the verb already makes the subject clear:

• não vou reescrever a conclusão

That already clearly means I am not going to rewrite the conclusion.

Including eu can add:

• emphasis
• contrast
• clarity

So:

• eu não vou reescrever a conclusão

may sound slightly more like:

• I am not going to rewrite the conclusion

Both versions are correct.

Outro means another or a different.

So outro texto could mean:

• another text
• a different text

The exact nuance depends on context.

For example, the professor might ask for:

• a completely different piece of writing
• a replacement text
• an additional text instead of just revising the conclusion

Portuguese often uses outro + noun without an article:

• outro livro
• outra ideia
• outro texto

You could also hear um outro texto, but outro texto is perfectly natural and common.

Because Portuguese uses definite articles much more often than English.

Here, a conclusão most likely refers to a specific conclusion, probably the conclusion of a paper, essay, or text already being discussed.

So:

• reescrever a conclusão = rewrite the conclusion

Without the article, reescrever conclusão would sound unnatural in this context.

Portuguese commonly says:

• o texto
• a introdução
• a conclusão
• o problema

where English might sometimes use no article or a different structure.

Possibly, but they are not always identical.

• texto is a broad word: text, piece of writing
• redação often refers more specifically to a composition, essay, or school writing assignment

So outro texto is broader and more neutral.

If the context were specifically school writing, outra redação might also work:

• A não ser que o professor peça outra redação...

But that changes the nuance a bit. Texto is the safer, more general word.

Yes, basically.

• escrever = to write
• reescrever = to rewrite

The prefix re- gives the idea of doing something again.

So:

• reescrever a conclusão = rewrite the conclusion

This often implies revising the wording, structure, or content, not just copying it again.

You could explain it as similar to:

• write it again
• rewrite it
• revise and rewrite it

depending on context.

Yes. A very natural alternative is:

• Eu não vou reescrever a conclusão, a não ser que o professor peça outro texto.

This keeps the same meaning.

The difference is mostly about focus:

• starting with A não ser que... emphasizes the condition first
• starting with Eu não vou reescrever... emphasizes the speaker’s decision first

Both are common.

It can suggest both, depending on tone and context.

Grammatically, it is a future construction:

• I’m not going to rewrite

But in real use, it can also express:

• a decision
• a firm intention
• mild refusal

So this sentence can sound like:

• I do not plan to rewrite the conclusion
• I’m not going to rewrite the conclusion unless the professor asks for another text

The emotional force depends on how it is said.

Not with exactly the same meaning.

• caso o professor peça outro texto = if the professor asks for another text
• a não ser que o professor peça outro texto = unless the professor asks for another text

Both can be followed by the subjunctive, but they express different logic:

• caso introduces a possibility: if
• a não ser que introduces an exception: unless

So replacing one with the other changes the meaning.

Yes, it sounds natural.

It uses several very common features of Brazilian Portuguese:

• a não ser que
  • subjunctive
• eu não vou + infinitive for the future
• normal use of the article in a conclusão

A Brazilian speaker might say exactly this in a discussion about schoolwork, essays, or revisions.