De onde você comprou esse sorvete? Daquela loja perto da vitrine grande.

De onde means from where, so it focuses on the source or origin.

That fits well with comprar, because you are asking where something was bought from. The answer also matches that structure:

• De onde...?
• Daquela loja...

So the de in the question is mirrored by the da in the answer.

That said, in everyday Brazilian Portuguese, many people also ask Onde você comprou esse sorvete?, which is very common and natural.

Yes. In Brazilian Portuguese, Onde você comprou esse sorvete? is extremely common.

The difference is mainly nuance:

• Onde você comprou...? = where did you buy it?
• De onde você comprou...? = from where did you buy it?

In real conversation, onde is often the more usual choice, while de onde sounds a bit more explicitly focused on the source.

Yes, it can be omitted if the context is clear:

• De onde você comprou esse sorvete?
• De onde comprou esse sorvete?

Both are possible.

However, in Brazilian Portuguese, subject pronouns like você are used more often than in some other varieties of Portuguese, because they help make the sentence clearer and more natural in conversation.

So você is not required here, but it is very normal.

In traditional grammar, the demonstratives are often explained like this:

• este = this, near the speaker
• esse = that / this, near the listener or already mentioned
• aquele = that over there, farther away

But in everyday Brazilian Portuguese, este is much less common in speech. People very often use esse where formal grammar might expect either este or esse.

So esse sorvete sounds very natural in Brazil.

Daquela is a contraction of:

• de + aquela = daquela

It means from that or from that one over there, and it agrees with loja, which is feminine singular.

So:

• aquele = masculine singular
• aquela = feminine singular

Because loja is feminine, you get aquela loja, and with de, that becomes daquela loja.

Because the question uses de onde, the answer naturally uses de too:

• De onde você comprou...?
• Daquela loja...

If the question were Onde você comprou esse sorvete?, then a very natural answer would be:

• Naquela loja...

So:

• de onde pairs well with daquela
• onde pairs well with naquela

Both patterns are natural; they just reflect slightly different ways of framing the question.

Because perto normally takes the preposition de:

• perto de

Then de + a contracts to da:

• perto de a vitrine → perto da vitrine

So perto da vitrine grande is the normal form.

This kind of contraction is very common in Portuguese.

In Portuguese, adjectives often come after the noun:

• vitrine grande
• casa bonita
• carro novo

So vitrine grande is the normal, straightforward order.

Sometimes adjectives can go before the noun, but that may sound more literary, emphatic, or may slightly change the feel or meaning. In this sentence, vitrine grande is the most natural choice.

Comprou is the preterite form of comprar for você/ele/ela.

It is used because the buying happened at a specific, completed moment in the past.

So:

• comprar = to buy
• você comprou = you bought

This is the normal tense for asking about a finished action like buying an ice cream.

Yes, that is possible, especially in informal spoken Brazilian Portuguese.

Compare:

• De onde você comprou esse sorvete? = more standard word order
• Você comprou esse sorvete de onde? = more conversational, with the question phrase at the end

Both can be heard, but the version with de onde at the beginning is the safer pattern for learners.

Because Portuguese, like English, often uses short answers when the rest is obvious.

Instead of saying:

• Eu comprei esse sorvete daquela loja perto da vitrine grande

the speaker can simply say:

• Daquela loja perto da vitrine grande

This is completely natural. The missing parts are understood from the question.

They must match the noun in gender and number.

Here:

• sorvete is masculine singular → esse sorvete
• loja is feminine singular → aquela loja
• vitrine is feminine singular → a vitrine

Also note that grande has the same form for masculine and feminine singular:

• sorvete grande
• vitrine grande

In the plural, it changes:

• sorvetes grandes
• vitrines grandes

So agreement is an important part of why the sentence looks the way it does.