O detetive chegou hoje.

O is the masculine singular definite article, meaning the.

So o detetive = the detective.

In Portuguese, articles are used more often than in English, so learners should get used to seeing o / a / os / as before nouns.

In this sentence, detetive is masculine because it uses o: o detetive.

But detetive is one of those nouns that often keeps the same form for both genders:

• o detetive = the male detective
• a detetive = the female detective

So the article usually shows the gender here.

Chegou is the preterite form of chegar (to arrive).

It means arrived in a completed past sense.

• ele chegou = he arrived
• o detetive chegou = the detective arrived

In this sentence, it refers to a completed action in the past.

Because chegou is the normal way to say a simple completed past action in Brazilian Portuguese.

• chegou = arrived
• chegava would suggest something habitual, ongoing, or backgrounded in the past
• tem chegado is a present perfect form, but Portuguese does not use it the same way English uses has arrived

For a sentence like this, chegou is the most natural choice.

Because Portuguese is flexible with adverb placement, and putting hoje at the end sounds very natural.

• O detetive chegou hoje.
• Hoje o detetive chegou.

Both are possible, but they can sound slightly different in emphasis:

• O detetive chegou hoje. = neutral
• Hoje o detetive chegou. = puts extra focus on today

Not in this exact sentence, because the detective is important information.

Portuguese often drops subject pronouns like ele, ela, nós, etc. when the verb already makes the subject clear. But a full noun like o detetive is usually kept when you want to name who did the action.

For example:

• Ele chegou hoje. = He arrived today.
• Chegou hoje. = possible in context, but now it means something like (He/She/It) arrived today, and the subject must be understood from context

In Brazilian Portuguese, chegou is roughly pronounced like sheh-GOH, with the stress on the last syllable.

A helpful breakdown:

• che sounds like sheh
• gou sounds like goh

The ch in Brazilian Portuguese usually sounds like sh.

A rough English-friendly pronunciation is deh-teh-CHEE-vee in Brazilian Portuguese, with stress on ti.

A closer breakdown:

• de
• te
• ti
• ve

In many Brazilian accents, ti before a vowel can sound a bit like chee, so detetive may sound close to deh-teh-CHEE-vee.

Because Portuguese usually does not need an extra helping verb like English sometimes does.

English can say:

• The detective arrived today.
• Did the detective arrive today?

Portuguese uses verb forms directly:

• O detetive chegou hoje.
• O detetive chegou hoje?

So the verb itself carries the tense, and intonation or punctuation can make it a question.

Yes, hoje can mean today, and in some contexts it can also mean nowadays.

But in this sentence, with the completed action chegou, the meaning is clearly today:

• O detetive chegou hoje. = the arrival happened today

If someone wanted to say nowadays, context would normally make that clear.

Yes. This is the standard and very common order:

article + noun + verb + time expression

• O detetive = subject
• chegou = verb
• hoje = time expression

This is a very natural basic sentence pattern in Brazilian Portuguese.

Yes, it is grammatically possible, but it is less neutral and sounds more marked or literary in many contexts.

The most natural everyday versions are:

• O detetive chegou hoje.
• Hoje o detetive chegou.

So for a learner, O detetive chegou hoje is the best basic pattern to remember.