Quiero plantear un asunto.

After querer when you say you want to do something, the next verb stays in the infinitive.

• Quiero plantear un asunto = I want to bring up a matter
• Quiero hablar = I want to speak
• Quiero comer = I want to eat

So quiero is the conjugated verb, and plantear stays unconjugated.

In Spanish, subject pronouns are often omitted because the verb ending already shows who the subject is.

• Quiero already means I want
• So yo is optional

You can say:

• Quiero plantear un asunto
• Yo quiero plantear un asunto

Both are correct. Adding yo gives extra emphasis, contrast, or clarity.

Here, plantear means something like:

• to raise
• to bring up
• to put forward
• to present for discussion

It is often used for topics, problems, questions, or issues.

So plantear un asunto sounds like bringing up a matter for consideration. It is more formal or deliberate than just decir algo.

Examples:

• Quiero plantear una duda = I want to raise a question
• Planteó un problema importante = He/She raised an important problem

Not exactly. Asunto is broader. It can mean:

• matter
• issue
• topic
• affair

It does not always mean something negative.

For example:

• un asunto importante = an important matter
• un asunto personal = a personal matter

If you specifically mean problem, problema is often more direct.

So Quiero plantear un asunto sounds like I want to bring up a matter, not necessarily I want to bring up a problem.

Un is the indefinite article, like a or an in English. It suggests the matter has not been specifically identified yet.

• Quiero plantear un asunto = I want to bring up a matter
• Quiero plantear el asunto = I want to bring up the matter

Use el if both speaker and listener already know which matter you mean.

Yes, it sounds fairly neutral to formal. Plantear and asunto are both words that fit well in professional, academic, or serious conversation.

In more casual speech, someone might say:

• Quiero hablar de algo
• Quiero comentar algo
• Quiero tocar un tema

So Quiero plantear un asunto is correct and natural, but it has a somewhat formal tone.

Often, yes. Quisiera can sound more polite, softer, or less direct than quiero.

Compare:

• Quiero plantear un asunto = I want to bring up a matter
• Quisiera plantear un asunto = I would like to bring up a matter

In meetings, formal settings, or polite conversation, quisiera is very common.

No. Plantear normally takes a direct object, so you say:

• plantear un asunto
• plantear una pregunta
• plantear un problema

Not:

• plantear de un asunto
• plantear sobre un asunto

So in this sentence, the structure is correct as it is.

Yes. That is very common if you want to show who you are bringing the matter up to.

• Quiero plantearte un asunto = I want to bring up a matter to you
• Quiero plantearle un asunto = I want to bring up a matter to you/him/her, in a more formal way

The te / le is an indirect object pronoun.

In most of Latin America, quiero is pronounced roughly like KYEH-ro.

A few pronunciation notes:

• qu before i sounds like k
• ie in quiero is a diphthong
• the r in quiero is a single flap, not the strong rolled rr

So it is approximately:

• quiero → KYEH-ro
• plantear → plan-teh-AR
• asunto → ah-SOON-to

Querer is a stem-changing verb. In the present tense, the e in the stem changes to ie in most forms.

Present tense:

• yo quiero
• tú quieres
• él/ella/usted quiere
• nosotros queremos
• ellos/ellas/ustedes quieren

So quiero is the correct yo form of querer.