Se a geleia acabar, eu vou comer torrada com manteiga.

Because after se when Portuguese talks about a real possibility in the future, it normally uses the future subjunctive:

• Se a geleia acabar... = if the jam runs out

Here, acabar is the future subjunctive form of acabar. For many regular verbs, that form looks exactly like the infinitive, so it can be confusing.

Compare:

• Se a geleia acabar, ...
• Se nós acabarmos, ...
• Se eles acabarem, ...

So the form is correct even though it looks like the dictionary form of the verb.

Here, se means if.

It introduces a condition:

• Se a geleia acabar = if the jam runs out
• eu vou comer torrada com manteiga = I’m going to eat toast with butter

So the whole sentence has the structure:

• If X happens, I will do Y.

Portuguese uses definite articles much more often than English does.

So a geleia literally looks like the jam, but in natural English we often just say jam. In Portuguese, the article helps show that we are talking about a specific jam already understood from the situation, such as the jam at home or on the table.

Without the article, the sentence would sound unnatural here.

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

• eu vou comer = very common, conversational
• eu comerei = correct, but more formal, literary, or less common in speech

So Brazilians often prefer the ir + infinitive future:

• vou comer
• vai chover
• vamos sair

It is the normal way to talk about the future in casual speech.

Yes. That is grammatically correct.

It uses the simple future:

• comerei = I will eat

But in Brazilian Portuguese, this sounds more formal or written than vou comer. In normal conversation, most speakers would prefer:

• Se a geleia acabar, eu vou comer torrada com manteiga.

Yes, it can be omitted:

• Se a geleia acabar, vou comer torrada com manteiga.

That is perfectly natural.

Portuguese often drops subject pronouns when the meaning is clear from the verb. However, speakers may still include eu for emphasis, clarity, or just personal speaking style.

So both are fine:

• eu vou comer
• vou comer

Because Portuguese often leaves out the article when talking about food in a general or nonspecific way.

So:

• comer torrada com manteiga = eat toast with butter

This sounds like a general food choice, not a specific piece of toast or a specific serving of butter.

If you added articles, the meaning would become more specific:

• comer a torrada com a manteiga = eat the toast with the butter

That sounds like particular toast and particular butter already identified in the situation.

Yes, torradas is also possible.

The singular torrada can sound like the food item in a general sense, similar to how English sometimes uses a mass-like idea for food. The plural torradas emphasizes actual pieces or slices.

So these are both possible, with a slight difference in feel:

• comer torrada com manteiga = eat toast with butter
• comer torradas com manteiga = eat some pieces/slices of toast with butter

In everyday use, either may be heard depending on the speaker and the exact image they have in mind.

Yes, absolutely.

Both orders are natural:

• Se a geleia acabar, eu vou comer torrada com manteiga.
• Eu vou comer torrada com manteiga se a geleia acabar.

When the se clause comes first, Portuguese usually writes a comma after it. When it comes second, there is usually no comma.

Because the sentence begins with a conditional clause:

• Se a geleia acabar

When this kind of introductory clause comes first, Portuguese normally separates it from the main clause with a comma:

• Se a geleia acabar, eu vou comer...

If the main clause comes first, the comma is usually not needed:

• Eu vou comer torrada com manteiga se a geleia acabar.

Yes, geleia is the current standard spelling in Brazil.

The older spelling geléia appeared before the spelling reform. After the reform, the accent was removed in words like this.

So in modern Brazilian Portuguese, you should write:

• geleia

You may still see geléia in older books, websites, or materials.

A common Brazilian pronunciation is approximately:

• zheh-LEY-a or zheh-LAY-a, depending on accent

A rough breakdown:

• ge sounds like the s in measure
• lei sounds somewhat like lay or ley
• a at the end is light

So geleia does not start with a hard g sound.

In Brazilian Portuguese, rr is usually pronounced with a strong throaty or h-like sound, depending on the region.

So torrada is roughly:

• toh-HA-da or toh-RA-da depending on accent

The important thing is that rr is not pronounced like the English r in red.

Also notice the difference between:

• r between vowels, which is often a flap sound
• rr, which is stronger

So torrada has that stronger rr sound.

Sometimes, but acabar is the most natural choice here.

Why? Because acabar is commonly used for supplies being used up or running out:

• O leite acabou.
• O pão acabou.
• A geleia acabou.

You might hear terminar in some contexts, but for food or something being finished/used up, acabar is usually the more idiomatic verb in Brazilian Portuguese.

Yes, that is the natural interpretation.

In food expressions, X com Y usually means X with Y as part of the dish or combination:

• pão com queijo
• arroz com feijão
• torrada com manteiga

So torrada com manteiga is understood as toast with butter on it or served with it, not just toast sitting next to unrelated butter.