O cérebro ajuda o corpo.

O is the masculine singular definite article, meaning the.

So:

• o cérebro = the brain
• o corpo = the body

Portuguese uses definite articles very naturally in places where English also uses the, and often even in places where English might leave it out.

In Portuguese, every noun has grammatical gender, usually masculine or feminine.

• cérebro is masculine
• corpo is masculine

That is why both use o, not a.

A lot of masculine nouns end in -o, and both of these do, but gender is something you learn with each noun. The ending often helps, but it is not a perfect rule.

In Brazilian Portuguese, cérebro is pronounced approximately like:

SEH-reh-broo

A more careful breakdown:

• cé = SEH
• re = reh
• bro = broo with a tapped or lightly pronounced r

The stress is on the first syllable: CÉ-re-bro.

The accent in cérebro shows where the stress goes and helps indicate the vowel quality.

So instead of stressing the middle or last part, you stress the first syllable:

• CÉ-re-bro

Without the accent, a learner might guess the stress incorrectly. In Portuguese, stress placement is very important for correct pronunciation.

Here, ajuda is the verb ajudar conjugated in the present tense, third person singular.

So:

• eu ajudo = I help
• você ajuda = you help
• ele/ela ajuda = he/she helps

In O cérebro ajuda o corpo, the subject is o cérebro, which is singular, so the verb must also be singular: ajuda.

Yes. Ajuda can also be a noun meaning help.

For example:

• Preciso de ajuda. = I need help.

But in O cérebro ajuda o corpo, it is clearly a verb, because it comes between the subject and the object:

• subject: o cérebro
• verb: ajuda
• object: o corpo

Because the subject is singular:

• o cérebro = singular

So the verb must also be singular:

• o cérebro ajuda

If the subject were plural, then you would use ajudam:

• Os cérebros ajudam os corpos.

So ajudam matches they help, while ajuda matches it helps or he/she helps.

Yes. This sentence follows the very common subject + verb + object pattern:

• O cérebro = subject
• ajuda = verb
• o corpo = object

So it works just like:

• The brain helps the body.

Portuguese can sometimes change word order for style or emphasis, but this basic order is the most neutral and common one.

Not normally. That sounds unnatural in standard Portuguese.

Portuguese usually wants the articles here:

• O cérebro ajuda o corpo.

Leaving them out can sound telegraphic, like a headline, note, or very unnatural learner Portuguese. In ordinary speech and writing, keep o before both nouns.

No, not in this sentence.

Ajudar normally takes a direct object, so you can say:

• ajudar o corpo
• ajudar a criança
• ajudar os amigos

So O cérebro ajuda o corpo is correct exactly as it is.

English speakers sometimes expect a preposition because verbs work differently from language to language, but here Portuguese is straightforward: ajudar + object.

The Portuguese present tense is flexible. Ajuda can mean:

• helps
• does help
• sometimes, depending on context, something close to is helping

In this sentence, the most natural English translation is simply helps.

So ajuda is present tense, but like many present-tense forms in Portuguese, its exact English wording depends on context.

You would make the nouns, articles, and verb plural:

• Os cérebros ajudam os corpos.

Changes:

• o → os
• cérebro → cérebros
• ajuda → ajudam
• corpo → corpos

This is a good example of agreement in Portuguese: articles, nouns, and verbs all change to match number.

A rough English-friendly pronunciation is:

oo SEH-reh-broo ah-ZHOO-dah oo KOR-poo

A few notes:

• o often sounds like oo
• the j in ajuda sounds like the s in measure or the zh sound
• the r in corpo is Brazilian Portuguese r, which can vary by region

A more natural rhythm is:

O CÉ-re-bro a-JU-da o COR-po.