A internet caiu, por isso vou continuar o trabalho offline.

In Brazilian Portuguese, it is very common to use definite articles with nouns, even in cases where English would not.

So a internet is natural and means the internet.

A few extra notes:

• Internet is usually treated as a feminine noun in Portuguese, so it takes a.
• Many Brazilians also say simply internet with no article, especially in casual speech.
• So both a internet caiu and internet caiu can be heard, but a internet caiu is perfectly normal.

Yes, literally caiu comes from cair, which means to fall.

But in this context, Portuguese uses cair idiomatically for things like:

• the internet
• a website
• a system
• the power
• a phone connection

So a internet caiu means something like:

• the internet went down
• the internet stopped working
• the connection dropped

This is a very common use of cair in Brazilian Portuguese.

Caiu is the preterite form of cair. It describes a completed event: the internet went down at a certain moment.

So the sentence presents the situation as:

1. the internet went down
2. therefore, I will continue working offline

Why not the others?

• caía would suggest an ongoing or habitual background situation, which does not fit as well here.
• tem caído would mean has been going down / has gone down repeatedly, which changes the meaning.

So caiu is the most natural choice for a single event that just happened.

Por isso means therefore, because of that, or for that reason.

It introduces a result/consequence.

So:

• A internet caiu, por isso vou continuar o trabalho offline. = The internet went down, so/therefore I’m going to continue the work offline.

This is different from porque, which means because and introduces a cause/reason.

Compare:

• Vou continuar o trabalho offline porque a internet caiu. = I’m going to continue the work offline because the internet went down.

So:

• porque = gives the reason
• por isso = gives the result

Vou continuar is the very common ir + infinitive future, similar to I’m going to continue.

In Brazilian Portuguese, this structure is extremely common in everyday speech and often sounds more natural than the simple future.

So:

• vou continuar = I’m going to continue
• continuarei = I will continue

Both are correct, but vou continuar is usually more conversational and natural in spoken Brazilian Portuguese.

O trabalho means the work and usually refers to a specific piece of work or the work the speaker is already doing.

In this sentence, that makes sense: the speaker is continuing a particular task or job already in progress.

Using the article makes it sound more specific.

Compare:

• continuar o trabalho = continue the work / continue the task
• continuar trabalhando = continue working

Both are possible, but they focus on slightly different things:

• o trabalho focuses more on the work itself
• trabalhando focuses more on the action of working

Yes, absolutely.

Vou continuar trabalhando offline is very natural and probably even more common in everyday speech.

The difference is small:

• vou continuar o trabalho offline = I’m going to continue the work offline
• vou continuar trabalhando offline = I’m going to keep working offline

So the first emphasizes the work/task, and the second emphasizes the action of working.

Both are correct and natural.

Yes. In Brazilian Portuguese, offline is widely used, especially in technology and work contexts.

It sounds normal in sentences like:

• trabalhar offline
• ficar offline
• usar o app offline

Depending on the context, you could also say things like:

• sem internet = without internet
• desconectado = disconnected
• sem conexão = without a connection

But offline is very common and natural.

The comma separates two clauses:

• A internet caiu
• por isso vou continuar o trabalho offline

Since por isso works like a connector meaning therefore / so / for that reason, it is normally set off with a comma in this kind of sentence.

So the punctuation helps show the logic clearly:

• event: the internet went down
• result: I’ll continue offline

In Brazilian Portuguese, caiu is pronounced roughly like ka-YOO, with the stress on the second syllable.

A more precise approximation is:

• ca = like kah
• iu = like yoo

So it is not pronounced as three clear English-style syllables. It sounds more like kah-YOO.

This is a common verb form, so it is useful to get used to it:

• cair = to fall
• caiu = fell / went down