Eu quero isto.

You can say either Eu quero isto or simply Quero isto.

In Brazilian Portuguese, subject pronouns are often optional because the verb ending already shows the subject. Since quero clearly means I want, eu is not required.

• Eu quero isto = more explicit, sometimes more emphatic
• Quero isto = very natural in everyday speech

People may include eu for emphasis, contrast, or clarity.

Because quero is the conjugated verb form, while querer is the infinitive.

• querer = to want
• quero = I want

So in a full sentence, you usually need the conjugated form:

• Eu quero isto. = correct
• Eu querer isto. = incorrect in normal grammar

Quero is the first person singular form of querer in the present tense.

That means it matches eu:

• eu quero = I want

Some other present-tense forms are:

• eu quero
• você quer
• ele/ela quer
• nós queremos
• vocês querem
• eles/elas querem

Isto is a demonstrative pronoun. It means this when it stands by itself instead of coming before a noun.

Compare:

• isto = this / this thing
• este livro = this book

So in Eu quero isto, isto is the object of the verb quero.

Traditionally, the difference is about distance or reference:

• isto = this, near the speaker
• isso = that, near the listener or something just mentioned
• aquilo = that over there, farther from both

So traditionally:

• Eu quero isto. = I want this.
• Eu quero isso. = I want that.

However, in everyday Brazilian Portuguese, the distinction is often less strict, and isso is extremely common in speech.

Use isto when the word stands alone as a pronoun. Use este before a masculine singular noun.

• Quero isto. = I want this.
• Quero este livro. = I want this book.

So:

• isto replaces the noun
• este goes with the noun

Related forms:

• isto = this
• este = this + masculine noun
• esta = this + feminine noun

Yes, it is grammatical and understandable, but in everyday Brazilian speech it can sound a little formal, careful, or bookish depending on context.

Very often, Brazilians might say things like:

• Quero isso.
• Eu quero isso aqui.
• Quero esse aqui. = if pointing to an item

So Eu quero isto is correct, but not always the most conversational choice.

A simple approximate pronunciation is:

eh-o KEH-ro EES-too

A few notes:

• eu sounds roughly like eh-o said quickly
• quero has stress on the first syllable: QUE-ro
• isto has stress on the first syllable: IS-to

In natural Brazilian speech, sounds may blend a bit, so it can come out more smoothly than the careful spelling suggests.

Yes, but Eu quero isto is the normal, neutral order.

Portuguese usually follows:

subject + verb + object

So:

• Eu quero isto. = standard

Other orders can happen, but they usually add emphasis or sound more marked:

• Isto eu quero. = This, I want. / This is what I want.

That version is possible, but it is not the default order for beginners to copy first.

It can be perfectly fine, especially in simple situations like pointing at an object in a store. But depending on tone and context, Eu quero isto may sound direct.

If you want to sound softer or more polite, Brazilians often say things like:

• Eu queria isto. = I would like this.
• Quero isto, por favor. = I want this, please.
• Eu vou querer isto. = I’ll have this.

So the sentence is not rude by itself, but politeness often depends on tone and added expressions such as por favor.

Yes. Isto can point to a thing, a situation, or even something you are about to say.

For example, it can refer to:

• a physical object
• a fact
• an idea
• a statement

So although Eu quero isto often suggests wanting a physical item, isto is not limited to objects. It can also refer to something more abstract if the context makes that clear.