O suor começou durante o treino.

In Portuguese, it is very common to use a definite article before a noun, even in cases where English would often leave it out.

So o suor literally means the sweat, but in natural English the sentence may simply be understood as sweat started during the workout.

A few important points:

• o = the for a masculine singular noun
• suor is masculine, so it takes o
• Portuguese uses articles more often than English does

For example:

• O treino foi difícil. = The workout was hard
• A febre começou ontem. = The fever started yesterday

Começou is the preterite form of começar, and it shows a completed event in the past: the beginning happened at a specific point.

Here, the idea is:

• at some moment during the workout, the sweat started

Compare:

• começa = starts / is starting (present)
• começou = started (completed past event)
• começava = used to start / was starting (imperfect, more ongoing/background)

So:

• O suor começou durante o treino. = the start is seen as a single event in the past

The subject is o suor.

That means começou is conjugated for ele/ela/você form, because o suor is a singular noun.

Breakdown:

• O suor = subject
• começou = verb
• durante o treino = time expression

Even though suor is not a person, Portuguese still uses the same third-person singular verb form for singular nouns.

Suor is a noun meaning sweat.

It refers to the substance itself, not the action in a grammatical sense.

Depending on context, English may translate it in different ways:

• sweat
• sometimes something like the sweating if the focus is on the process

But grammatically in Portuguese, suor is a noun.

Related words:

• suar = to sweat (verb)
• suado = sweaty / sweated

Example:

• Eu comecei a suar durante o treino. = I started sweating during the workout

That sentence uses the verb suar, while your original sentence uses the noun suor.

Yes, absolutely. That is often a more personal and natural way to express the idea if you want to emphasize the person doing the sweating.

Compare:

• O suor começou durante o treino. = focuses on the sweat
• Eu comecei a suar durante o treino. = focuses on I started sweating

The second version is usually more common in everyday speech, because it sounds more natural to describe a person beginning to sweat rather than the sweat beginning.

So the original sentence is grammatical, but in real conversation many speakers might prefer:

• Comecei a suar durante o treino.
• Eu comecei a suar durante o treino.

Durante means during.

It is a preposition used before a noun phrase to show that something happened within a period or event.

Here:

• durante o treino = during the workout

More examples:

• durante a aula = during class
• durante a noite = during the night
• durante a viagem = during the trip

It is followed by a noun, not a verb.

So:

• durante o treino is correct
• you would not normally use durante the same way English sometimes uses while

Because treino is a masculine singular noun, so it takes the article o.

Also, durante itself does not change the article. You simply keep the normal article that belongs with the noun phrase:

• durante o treino
• durante a aula
• durante os jogos
• durante as férias

So:

• treino = workout / training session
• o treino = the workout
• durante o treino = during the workout

Treino usually means:

• training
• practice
• workout

The best translation depends on context.

In this sentence, workout is probably the most natural English meaning, especially if the context is exercise or the gym.

Examples:

• Tenho treino de futebol hoje. = I have soccer practice today.
• O treino foi pesado. = The workout was intense.
• Ela faltou ao treino. = She missed practice.

So treino is a flexible word connected with physical practice, sports, or exercise.

It is grammatical, but it may sound a bit less natural than other ways of saying the same thing.

Why? Because Portuguese speakers often prefer to say that someone started sweating, rather than that the sweat started.

More natural alternatives might be:

• Comecei a suar durante o treino.
• Eu comecei a suar durante o treino.
• O suor apareceu durante o treino. if you specifically want to focus on the sweat appearing

So the original sentence is understandable, but depending on context it may sound slightly unusual or literary.

Yes, it can.

Começar can be used with many kinds of subjects, including events, processes, or conditions.

Examples:

• A chuva começou cedo. = The rain started early.
• A dor começou ontem. = The pain started yesterday.
• O problema começou na semana passada. = The problem started last week.

So O suor começou... is structurally fine. It treats sweat as something whose onset began at that moment.

Still, whether it feels fully natural depends on style and context.

In Brazilian Portuguese, começou is pronounced approximately like:

ko-meh-SOH

A few pronunciation notes:

• ç sounds like s
• the stress is on the last syllable: çou
• the ending ou in Brazilian Portuguese usually sounds like oh, not like English ow

So:

• começou ≈ ko-meh-SOH

And the full sentence is approximately:

• O suor começou durante o treino
• oo soo-OR ko-meh-SOH doo-RAHN-chee oo TRAY-noo

That is only an approximation, but it can help with the basic rhythm.

Yes. Portuguese allows some flexibility in word order, especially with time expressions.

These are all possible:

• O suor começou durante o treino.
• Durante o treino, o suor começou.

The first one is more neutral and natural in most cases.

The second one puts more emphasis on the time frame, and in this specific sentence it may sound a little more marked or literary.

So yes, the phrase can move, but the original order is the most straightforward.