A veces necesito suspirar antes de contestar una pregunta difícil.

Spanish often leaves out subject pronouns because the verb ending already tells you who the subject is. Necesito already means I need, so yo is not necessary.

You could say Yo a veces necesito suspirar..., but that would usually add emphasis, contrast, or emotion.

A veces is a fixed expression meaning sometimes.

Literally, it is something like at times, which is why veces is plural. Spanish uses this plural expression where English usually uses the single word sometimes.

You may also hear algunas veces, which means the same thing, but a veces is very common and natural.

The Spanish present tense is often used for habits or repeated actions, not just for what is happening right now.

So A veces necesito... means that this happens on some occasions in general. It is a normal way to talk about something that happens from time to time.

Yes. Spanish adverbial expressions like a veces can be fairly flexible.

For example, you could also say:

• Necesito a veces suspirar antes de contestar una pregunta difícil.

But putting a veces at the beginning is very natural and clear, especially in everyday Spanish.

After necesitar, Spanish normally uses a bare infinitive when the same person does both actions.

So:

• Necesito suspirar
• Necesito descansar
• Necesito pensar

This works like English I need to sigh / rest / think, except Spanish does not use a separate word equivalent to to before the infinitive here.

Spanish uses antes de + infinitive to mean before doing something.

So:

• antes de contestar = before answering
• antes de salir = before leaving
• antes de dormir = before sleeping

The de is required in this structure.

If a full clause with a different subject comes after it, Spanish usually changes to antes de que + subjunctive:

• antes de que él conteste

Yes. Contestar and responder can both mean to answer.

In Spain, contestar una pregunta sounds very natural. Responder una pregunta or responder a una pregunta is also correct.

Very generally:

• contestar is common in everyday speech
• responder can sound a little more neutral or formal in some contexts

But both are good choices.

Here, una pregunta difícil is the thing being answered, so it works as a direct object.

The so-called personal a is mainly used with people:

• Contesto a María
• Veo a mi profesor

With pregunta, the sentence contestar una pregunta is completely normal.

In Spanish, adjectives often come after the noun in their most neutral, ordinary use.

So una pregunta difícil is the normal way to say a difficult question.

If you put the adjective before the noun, it often sounds more literary, emphatic, or stylistically marked:

• una difícil pregunta

That is possible, but much less neutral.

The written accent shows where the stress goes: di-FÍ-cil.

Without the accent mark, Spanish spelling rules would suggest a different stress pattern. The accent is there to show the correct pronunciation.

So the stressed syllable is fí.

Normally, no.

In standard Spanish, a short introductory expression like A veces usually does not need a comma:

• A veces necesito suspirar...

A comma might appear if a writer wants a special pause or emphasis, but in a normal sentence it is usually left out.