No primeiro parágrafo, eu repeti o título sem querer.

No is the contraction of em + o.

• em = in, on, at
• o = the

So:

• em o primeiro parágrafo → no primeiro parágrafo

This contraction is required in normal Portuguese.

Other common contractions:

• em + a = na
• em + os = nos
• em + as = nas

So No primeiro parágrafo means In the first paragraph.

In Portuguese, ordinal numbers like primeiro usually come before the noun:

• o primeiro parágrafo = the first paragraph
• a primeira página = the first page

Putting the ordinal after the noun is unusual in everyday speech and can sound formal, technical, or stylistically marked in some contexts. For a normal sentence, o primeiro parágrafo is the natural order.

Literally, sem querer means without wanting to.

In real use, it commonly means:

• by accident
• accidentally
• without meaning to

So:

• eu repeti o título sem querer = I repeated the title by accident

It is a very common everyday expression in Brazilian Portuguese.

Examples:

• Apaguei o arquivo sem querer. = I deleted the file by accident.
• Cliquei sem querer. = I clicked by accident.

Yes, eu could be omitted.

Portuguese often drops subject pronouns when the verb form already makes the subject clear:

• Eu repeti o título sem querer.
• Repeti o título sem querer.

Both are correct.

Including eu can:

• add emphasis
• make the sentence a little clearer
• sound more natural in some contexts, especially in speech

Because repeti clearly means I repeated, the pronoun is not necessary grammatically.

Repeti is the 1st person singular of the pretérito perfeito (simple past) of the verb repetir.

• infinitive: repetir = to repeat
• eu repeti = I repeated

This tense is used for a completed action in the past.

Examples:

• Eu repeti o título. = I repeated the title.
• Ela repetiu a frase. = She repeated the sentence.

A short conjugation of repetir in this tense:

• eu repeti
• você/ele/ela repetiu
• nós repetimos
• vocês/eles/elas repetiram

The comma separates the introductory phrase from the main clause.

• No primeiro parágrafo = introductory location phrase
• eu repeti o título sem querer = main statement

So the comma helps readability:

• No primeiro parágrafo, eu repeti o título sem querer.

In short sentences, Portuguese punctuation can sometimes be a bit flexible, but this comma is very natural and standard here.

Portuguese often uses definite articles more frequently than English.

Here, o título means the title, referring to a specific title already understood from context, such as the title of a text, essay, or document.

Compare:

• repeti o título = I repeated the title
• repeti um título = I repeated a title

Using o shows it is a specific, known title.

Yes. Portuguese allows some flexibility in word order.

The original sentence:

• No primeiro parágrafo, eu repeti o título sem querer.

Other possible versions:

• Eu repeti o título sem querer no primeiro parágrafo.
• Sem querer, eu repeti o título no primeiro parágrafo.

These all make sense, but they place the emphasis a little differently:

• No primeiro parágrafo... emphasizes where
• Sem querer... emphasizes that it was accidental
• Eu repeti o título... starts more directly with the action

The original version sounds very natural.

Yes, parágrafo is masculine:

• o parágrafo
• no primeiro parágrafo

Many nouns ending in -a are feminine, but not all of them. Parágrafo is one of the masculine exceptions.

You usually learn noun gender together with the article:

• o parágrafo
• o problema
• o mapa

So it is best to memorize parágrafo as o parágrafo.

Yes. Primeiro is an ordinal adjective meaning first.

It agrees in gender and number with the noun:

• o primeiro parágrafo = the first paragraph
• a primeira frase = the first sentence
• os primeiros capítulos = the first chapters
• as primeiras linhas = the first lines

Because parágrafo is masculine singular, the form is primeiro.

A rough pronunciation guide:

• título ≈ TEE-too-loo
• parágrafo ≈ pa-RA-gra-foo

A few useful notes:

• The accented syllable in título is the first one: TÍ
• The accented syllable in parágrafo is also marked by the accent: RÁ
• In Brazilian Portuguese, unstressed final -o often sounds like oo in many accents

The written accents help show stress:

• título
• parágrafo

Yes. Por engano is another way to say by mistake or by accident.

So you could say:

• No primeiro parágrafo, eu repeti o título por engano.

Difference in feel:

• sem querer = without meaning to, unintentionally
• por engano = by mistake

They are very similar here, but sem querer is especially common and conversational.

It is not exactly wrong, but it is not the normal everyday phrasing for this context.

• No primeiro parágrafo = natural, standard
• No parágrafo primeiro = marked, uncommon, possibly formal or stylistic

A learner should strongly prefer no primeiro parágrafo.

More or less, yes:

• No = in the
• primeiro = first
• parágrafo = paragraph
• eu = I
• repeti = repeated
• o título = the title
• sem querer = without wanting / by accident

A very literal version would be:

• In the first paragraph, I repeated the title without wanting to.

But the most natural English translation is usually:

• In the first paragraph, I repeated the title by accident.