O homem trabalha hoje.

O is the masculine singular definite article, meaning the.

So:

• o = the for a masculine singular noun
• homem = man

Together, o homem means the man.

In Portuguese, articles are used very often, sometimes more often than in English.

Because o means the, while um means a/an.

So:

• o homem = the man
• um homem = a man

If the English meaning shown to the learner is The man works today, then o homem is the correct choice.

Yes. Homem is a masculine noun, and it also refers to a male person.

That is why it takes the masculine article o.

Compare:

• o homem = the man
• a mulher = the woman

The article must agree with the noun in gender and number.

Because the subject is o homem, which is he / the man, so the verb has to be in the third person singular.

The verb is trabalhar = to work.

Present tense:

• eu trabalho = I work
• você / ele / ela trabalha = you / he / she works
• nós trabalhamos = we work
• vocês / eles / elas trabalham = you all / they work

Since o homem is singular, we use trabalha.

It is the present indicative.

In this sentence, trabalha can often translate as:

• works
• sometimes is working, depending on context

Portuguese simple present is commonly used in a broader way than English simple present.

So O homem trabalha hoje most naturally means The man works today, but in some contexts it may also imply The man is working today.

Portuguese does not use do/does/did the way English does.

In English, do/does can be used:

• to form questions
• for emphasis
• in negatives

Portuguese usually handles those differently.

For this sentence:

• O homem trabalha hoje. = The man works today.

A question would normally be made by intonation or punctuation:

• O homem trabalha hoje? = Does the man work today?

A negative would use não:

• O homem não trabalha hoje. = The man does not work today.

Yes. Portuguese word order is flexible, although some orders sound more natural than others.

These are all possible:

• O homem trabalha hoje.
• Hoje o homem trabalha.
• O homem hoje trabalha. (less common in everyday speech, but possible depending on style or emphasis)

The most neutral version here is O homem trabalha hoje.

Putting hoje first often gives it a little more emphasis:

• Hoje o homem trabalha. = Today, the man works.

You usually need the subject unless it is already clear from context.

Portuguese often allows omitted subjects, but only when the listener can understand who is being talked about.

For example:

• Trabalho hoje. = I work today / I’m working today.
• Trabalhamos hoje. = We work today.

But trabalha could mean:

• he works
• she works
• you work (formal você)

So if the subject is not already known, trabalha hoje by itself is less clear. That is why o homem trabalha hoje clearly states who is working.

In Brazilian Portuguese, homem is approximately pronounced like OH-meng or OH-meny, depending on accent, but neither of those spellings is exact.

A few important pronunciation points:

• The h is silent.
• The first syllable is ho.
• The ending -em is nasal in Brazilian Portuguese.

A rough IPA pronunciation is /ˈɔmẽj̃/ in many Brazilian accents.

For an English speaker, the most important thing is:

• do not pronounce the h
• do not say a strong English m at the end
• try to make the ending nasal

Yes, in Brazilian Portuguese the lh combination is usually pronounced like a palatal sound somewhat similar to the lli in million for many English speakers.

So trabalha is roughly:

• tra-BA-lya

But this is only an approximation.

Important pronunciation notes:

• tr in Brazil often sounds a bit like chr before i, but here it is before a, so it stays closer to tr
• stress falls on ba
• lh is a special Portuguese sound, not a normal English l

Because the sentence is singular: the man.

Everything agrees with that singular subject:

• o = masculine singular article
• homem = singular noun
• trabalha = singular verb form

If it were plural, it would become:

• Os homens trabalham hoje. = The men work today.

Notice the changes:

• o → os
• homem → homens
• trabalha → trabalham

Yes, depending on context, it can.

Portuguese present tense often covers meanings that English splits into:

• works
• is working

So O homem trabalha hoje may mean:

• The man works today
• The man is working today

If you specifically want to emphasize an ongoing action right now, Brazilian Portuguese often uses:

• O homem está trabalhando hoje.

That is closer to The man is working today in a more explicitly progressive sense.

Yes, it is a natural and correct sentence.

That said, in everyday conversation, people often choose subjects that are more context-based or personal, such as:

• Ele trabalha hoje. = He works today.
• Hoje ele trabalha. = Today he works.

Using o homem is still perfectly grammatical; it just sounds like you are specifically referring to the man rather than using a pronoun.