El concurso de preguntas incluye una ronda temática.

In Spanish, it is very common to use the definite article el with nouns when talking about a specific thing: el concurso = the quiz/contest.

If you remove el, the sentence can still be possible in some contexts, especially in headlines or labels, but in normal full sentences Spanish usually prefers the article here.

Literally, concurso de preguntas is something like contest of questions.

Here, de often works like of, but in natural English we would usually say quiz contest, question quiz, or simply quiz depending on context.

Spanish uses de very often to connect nouns:

• concurso de preguntas
• taza de café
• libro de historia

So yes, de often corresponds to of, but you should translate the whole phrase naturally, not always word-for-word.

Because the contest involves multiple questions, not just one.

• pregunta = question
• preguntas = questions

So concurso de preguntas means a contest based on questions in general. Using the plural sounds natural here.

In Spanish, after de, it is often normal not to use an article when you are talking about a type or category rather than specific items.

So:

• concurso de preguntas = a question-based contest / quiz contest

If you said concurso de las preguntas, it would sound like you were talking about some specific questions already known in the conversation, which is not the idea here.

Because the subject is singular: El concurso.

• el concurso = singular
• incluye = it includes

So the verb must agree with concurso, not with preguntas.

Breakdown:

• yo incluyo
• tú incluyes
• él/ella/usted incluye
• ellos/ellas/ustedes incluyen

Even though preguntas is plural, it is not the subject of the sentence.

It is the present indicative of incluir.

So incluye means:

• includes
• sometimes does include, depending on emphasis

In this sentence it states a fact: the quiz includes a themed round.

Because ronda is a feminine singular noun, so both the article and the adjective must match it:

• una = feminine singular article
• ronda = feminine singular noun
• temática = feminine singular adjective

This is standard gender and number agreement in Spanish.

Compare:

• un tema interesante
• una ronda temática

In Spanish, descriptive adjectives usually come after the noun.

So:

• ronda temática = themed round / thematic round

This is the normal order. Putting the adjective before the noun is sometimes possible in Spanish, but it often changes the tone or emphasis, and it would not be the usual choice here.

It can correspond to both, depending on context.

• ronda temática literally matches thematic round
• in more natural English, themed round is often better

For example, a quiz round about cinema, history, or music could be called una ronda temática.

Not naturally in this context. Una ronda temática is the better and more idiomatic phrase.

De tema by itself does not sound as natural here. If you want to be more explicit, you could say something like:

• una ronda sobre un tema concreto
• una ronda dedicada a un tema

But ronda temática is the neat, standard way to say themed round.

In standard Spain Spanish, incluye is pronounced approximately een-KLOO-yeh.

A few useful notes:

• in- sounds like een
• clu has the stress: clu
• y in incluye sounds like a consonant similar to an English y, though the exact sound varies by region

So the stress is on clu: in-CLU-ye.

It is understandable and correct. Depending on context, native speakers might also use other expressions, such as:

• concurso
• quiz
• concurso de cultura general
• concurso de preguntas y respuestas

But concurso de preguntas is perfectly clear and works well for learners.

Yes. Concurso is quite flexible. It can refer to:

• a general contest or competition
• a quiz competition
• a TV game show, depending on context

So El concurso de preguntas incluye una ronda temática could describe many kinds of quiz formats. The surrounding context would tell you exactly which kind.

Sometimes, but incluye is the safest and most direct choice here.

• incluye = includes
• lleva can sometimes mean has or contains, especially in informal speech

For a structured activity like a quiz format, incluye sounds more precise:

• El concurso incluye una ronda temática = very natural

Using lleva is possible in some contexts, but it is less neutral and exact than incluye.