Ao fim da tarde, levamos as crianças ao parque infantil para brincarem um pouco.

It means at the end of the afternoon, which in natural English is usually late afternoon or sometimes early evening.

In European Portuguese, ao fim da tarde is a very common time expression. It does not mean the whole afternoon; it points to the later part of it, when the day is starting to wind down.

A few nearby expressions:

• à tarde = in the afternoon
• ao fim da tarde = late in the afternoon / toward evening
• à noite = at night / in the evening depending on context

Because ao is the contraction of a + o.

So:

• a + o = ao
• a + a = à
• de + o = do
• em + o = no

In this sentence:

• ao fim da tarde = a + o fim da tarde
• ao parque infantil = a + o parque infantil

Portuguese makes these contractions automatically, so a o parque would be wrong.

It can be either, and that is something learners often notice.

Levamos can mean:

• we take or we are taking — present
• we took — simple past (preterite)

The form is the same in both tenses for nós.

So the tense is understood from context. In an isolated sentence, it could be ambiguous. If the meaning shown to the learner is something like we took the children..., then it is being understood as past.

Compare:

• Hoje levamos as crianças ao parque. = Today we take / are taking the children to the park.
• Ontem levamos as crianças ao parque. = Yesterday we took the children to the park.

Because Portuguese uses definite articles much more often than English.

So as crianças literally looks like the children, but in many contexts it is the normal way to say simply the children or even what English might sometimes express without such a strong article feeling.

Here it refers to a specific group of children already understood in the situation, so as crianças is completely natural.

This wider use of articles is very common in Portuguese, including before common nouns and sometimes even before people’s names in European Portuguese.

In this context, parque infantil means children’s playground or play park.

The adjective infantil here means for children, not childish in the negative English sense.

So:

• parque infantil = a playground for children
• not a strange infantile park

In Portugal, parque infantil is a very normal expression.

Because ao is used here to show destination: they took the children to the playground.

• ao parque infantil = to the playground
• no parque infantil = in / at the playground

So:

• Levamos as crianças ao parque infantil. = We took the children to the playground.
• As crianças estavam no parque infantil. = The children were at/in the playground.

That is the main difference: ao shows movement toward a place; no shows location.

Yes, you could, but ao parque infantil is very natural here.

With verbs of movement, both a and para can be used, but they do not always feel exactly the same.

Very broadly:

• a / ao often gives a simple idea of going to a destination
• para / para o can sometimes emphasize direction, purpose, or going there to stay there for some time

With levar, European Portuguese often uses a very naturally:

• levar as crianças ao parque
• levar alguém à escola
• levar alguém ao médico

So in this sentence, ao parque infantil sounds very idiomatic.

Because Ao fim da tarde is a fronted time expression, and the comma helps separate it from the main clause.

So the structure is:

• Ao fim da tarde, = time frame
• levamos as crianças ao parque infantil... = main event

The comma is very natural here, especially in writing. It makes the sentence easier to read. Without it, the sentence would still be understandable, but the version with the comma is better style.

Because Portuguese can use the personal infinitive, and this sentence is a classic case for it.

Here, the people doing the playing are as crianças, not nós. So Portuguese marks that by using:

• para brincarem = for them to play

This is the infinitive brincar with a plural ending that agrees with the understood subject as crianças.

That is why brincarem is very natural here.

A helpful way to see it:

• nós did the taking
• as crianças did the playing

Since the subject of the second action is different, Portuguese often uses the personal infinitive.

Brincarem is the personal infinitive of brincar for eles/elas/vocês.

The personal infinitive is a special feature of Portuguese. It is still an infinitive, but it can show who the subject is.

For brincar, the personal infinitive forms are:

• brincar = eu / ele / ela / você / impersonal form
• brincares = tu
• brincarmos = nós
• brincardes = vós
• brincarem = eles / elas / vocês

So in the sentence:

• para brincarem um pouco = so that they can play for a bit

Yes. Para elas brincarem is grammatically correct.

The pronoun elas is usually omitted here because the subject is already clear from as crianças. Portuguese often leaves subject pronouns out when they are not needed.

So:

• para brincarem um pouco = natural and concise
• para elas brincarem um pouco = also correct, but more explicit

You might include elas for emphasis, contrast, or clarity.

Not necessarily wrong in informal use, but para brincarem um pouco is more precise and more standard in this sentence.

Because the children are the ones who will play, the personal infinitive makes that relationship clear.

So:

• para brincarem um pouco = clearly so that the children could play a bit
• para brincar um pouco = can still be understood, but it does not mark the subject as clearly

For learners, it is a good idea to notice that Portuguese often prefers the personal infinitive when the subject is identifiable and especially when it is different from the subject of the main verb.

Here um pouco means a little, for a bit, or for a little while.

In this sentence, it refers to duration or extent:

• brincarem um pouco = play for a bit

It makes the sentence sound natural and everyday, as if they went there for a short time, not for hours.

Yes, a few things feel very natural in European Portuguese:

• ao fim da tarde is a very common way to say late afternoon
• parque infantil is the normal term for playground
• levar ... ao ... is a very idiomatic way to express taking someone somewhere
• the use of the personal infinitive in para brincarem is very characteristic of Portuguese in general and very important to master

So overall, this sentence sounds very natural for Portugal.

A rough European Portuguese pronunciation is:

Ao fim da tarde, levamos as crianças ao parque infantil para brincarem um pouco.

Approximate IPA: [aw fĩ dɐ ˈtaɾdɨ lɨˈvɐmuʒ ɐʃ kɾiˈɐ̃sɐʃ aw ˈpaɾk(ɨ) ĩfɐ̃ˈtil ˈpaɾɐ bɾĩˈkaɾẽj̃ ũ ˈpoku]

A few pronunciation points:

• as crianças: the s in as is pronounced like sh before the c sound
• levamos: in European Portuguese, unstressed vowels are often reduced, so it may sound closer to l'vâmos
• infantil: the first in- is nasal
• brincarem: the final -em is nasal in European Portuguese

You do not need to pronounce every written vowel strongly; European Portuguese often reduces unstressed vowels a lot.