También ponen un documental sobre el mar y una película de suspense que parece interesante.

In Spanish, poner has several common meanings. One of them is used for TV, radio, cinema schedules, etc., where it means to show, to put on, or to broadcast.

So:

• Ponen un documental = They’re showing a documentary / They show a documentary

This is very common when talking about what is on TV or at the cinema.

Examples:

• Hoy ponen una comedia. = They’re showing a comedy today.
• En la tele ponen las noticias a las nueve. = They show the news at nine on TV.

Often, ponen is an impersonal or vague they. It does not necessarily refer to a specific group of people.

In English, we often do something similar:

• They’re showing a good film tonight.

You may not know exactly who they are; it just means the TV channel, the cinema, or the people in charge of programming.

So in this sentence, ponen is best understood as:

• they’re showing
• it’s on
• they’re putting on

Because Spanish usually does not need subject pronouns unless they are necessary for emphasis, contrast, or clarity.

The ending -en in ponen already tells you it is they / you plural (ustedes), so ellos is normally omitted.

Compare:

• Ponen un documental. = They’re showing a documentary.
• Ellos ponen un documental. = more emphatic, like They are the ones showing a documentary.

In most normal sentences, Spanish sounds more natural without the pronoun.

También means also or too.

In this sentence:

• También ponen... = They also show...

Putting también near the beginning is very natural in Spanish. It highlights that this is another thing being shown.

Spanish word order is a bit flexible, so you could also hear:

• Ponen también un documental...

But También ponen... is a very common and natural order.

Because nouns in Spanish have grammatical gender:

• documental is masculine → un documental
• película is feminine → una película

This is why the article changes:

• un for masculine singular nouns
• una for feminine singular nouns

Examples:

• un libro
• una revista

Sobre means about or on the subject of.

So:

• un documental sobre el mar = a documentary about the sea

If you said del mar, that would literally mean of the sea or from the sea, which is a different idea and usually not what you want for the topic of a documentary.

Compare:

• un libro sobre historia = a book about history
• un documental sobre animales = a documentary about animals

So sobre is the normal preposition for the topic of something.

De is often used in Spanish to describe the type, genre, or category of something.

So:

• una película de suspense = a suspense film / a thriller

Other examples:

• una película de terror = a horror film
• una película de acción = an action film
• una novela de amor = a love story / romance novel

In Spain, suspense is a very normal word for this genre. In other Spanish-speaking countries, you may also hear suspenso.

The verb parece is singular because que parece interesante describes una película, which is singular.

Structure:

• una película de suspense
  • que parece interesante
• a suspense film
  • that seems interesting

So the relative clause que parece interesante refers to película, not to both things together.

If it referred to plural nouns, then the verb would be plural:

• dos películas que parecen interesantes = two films that seem interesting

Here, que means that or which in a relative clause.

So:

• una película de suspense que parece interesante means
• a suspense film that seems interesting

It connects the noun película to extra information about it.

This is one of the most common uses of que in Spanish.

Examples:

• El libro que leo = The book that I’m reading
• La chica que canta = The girl who is singing

Because in película de suspense, suspense is being used as a genre label after de.

This is very common in Spanish:

• película de terror
• película de acción
• película de ciencia ficción

You normally do not put an article there, because it is not the suspense in a literal sense; it is the category or style of the film.

Because interesante is an adjective with the same form for both masculine and feminine singular.

So you say:

• un libro interesante
• una película interesante

The adjective does not change for gender here.

It only changes for number:

• un libro interesante
• dos libros interesantes
• una película interesante
• dos películas interesantes

Yes. In many contexts, parecer can be translated as:

• to seem
• to look
• to appear

So:

• parece interesante can be:
  • it seems interesting
  • it looks interesting

The best translation depends on the context, but the core idea is that it gives the impression of being interesting.

It is talking about two things being shown:

1. un documental sobre el mar
2. una película de suspense que parece interesante

They are joined by y = and.

So the structure is:

• They also show [a documentary about the sea] and [a suspense film that seems interesting].

Notice that que parece interesante most naturally describes only the film, not the documentary.

Yes. Spanish present tense often covers both ideas, depending on context.

So ponen can be translated as:

• they show
• they are showing

Both can work:

• They also show a documentary about the sea...
• They’re also showing a documentary about the sea...

If this is about a TV schedule or what is on today, English often prefers they’re showing.

A natural English version could be:

• They’re also showing a documentary about the sea and a thriller that looks interesting.
• They also have a documentary about the sea on, and a thriller that seems interesting.

If you want to stay closer to the Spanish wording, you could say:

• They’re also showing a documentary about the sea and a suspense film that seems interesting.

But in everyday English, thriller is usually more natural than suspense film.