Antes de imprimir, voy a marcar el título con el subrayador amarillo.

In Spanish, antes de + infinitive is the normal pattern for before doing something.

So:

• antes de imprimir = before printing

You use antes de + infinitive when the next action is expressed as a verb in its basic form.

If Spanish uses a full clause with a subject and a conjugated verb, then it changes to:

• antes de que + subjunctive

For example:

• Antes de imprimir, voy a marcar el título.
• Antes de que imprimas, voy a marcar el título.

So antes que imprimir is not the natural structure here.

Because it comes after antes de, and after that structure Spanish normally uses the infinitive.

So:

• antes de imprimir
• antes de salir
• antes de comer

This is very similar to English before printing / before leaving / before eating.

If you want to mention who does the action with a full clause, then you stop using the infinitive and use:

• antes de que + subjunctive

Example:

• Antes de que él imprima el documento...

Voy a marcar is the very common near future / intention structure in Spanish:

• ir a + infinitive

Here:

• voy = I go / I am going
• a marcar = to mark

Together, voy a marcar means I’m going to mark.

This is one of the most common ways to talk about a future action in everyday Spanish, especially in speech.

Yes. Marcaré is the simple future: I will mark.

So both are possible:

• Voy a marcar el título...
• Marcaré el título...

The difference is mostly about style and feel:

• voy a marcar sounds very natural and immediate
• marcaré can sound a bit more formal, more neutral, or a little less conversational

In everyday spoken Spanish, ir a + infinitive is extremely common.

Marcar is a general verb meaning to mark. It does not specify exactly how the mark is made.

In this sentence, because we also have con el subrayador amarillo, the idea is that the speaker is going to mark or highlight the title using a yellow highlighter.

Subrayar is more specific. It often means:

• to underline
• sometimes to highlight, depending on context

So:

• marcar = general
• subrayar = more specific

If the speaker specifically wants to say underline/highlight the title, then subrayar could also work:

• Antes de imprimir, voy a subrayar el título con el subrayador amarillo.

But marcar is broader and safely covers the idea of making the title stand out.

Because Spanish normally needs an article before a singular countable noun in this kind of sentence.

So:

• el título = the title

Saying just título here would sound incomplete.

The article tells us we are talking about a specific title, probably the title of the document being printed.

Compare:

• Voy a marcar el título. = I’m going to mark the title.
• Voy a marcar un título. = I’m going to mark a title.

Here amarillo describes subrayador, not título.

That is because:

• subrayador is masculine singular
• amarillo is also masculine singular
• the adjective is placed right after subrayador

So the phrase means:

• with the yellow highlighter

not

• the yellow title

If you wanted to describe the title as yellow, you would normally say something like:

• el título amarillo = the yellow title

But in this sentence, the most natural reading is clearly that the highlighter is yellow.

El suggests a specific highlighter, one that is already known in the situation:

• el subrayador amarillo = the yellow highlighter

Maybe there is a particular yellow highlighter on the desk, or the speaker and listener both know which one it is.

If you say:

• un subrayador amarillo

that means a yellow highlighter, with less specificity.

So both are grammatical, but they are not exactly the same:

• con el subrayador amarillo = with the yellow highlighter
• con un subrayador amarillo = with a yellow highlighter

Yes, it is a normal and understandable word in Spain.

It refers to the tool used to highlight text. In English, that is usually highlighter.

Depending on region and person, you may also hear other words, such as:

• marcador fluorescente
• rotulador fluorescente

But subrayador is perfectly good Spanish, and in a Spain-focused context it is natural.

Because Antes de imprimir is an introductory time expression placed before the main clause.

Spanish often uses a comma after this kind of opening phrase:

• Antes de imprimir, voy a marcar el título...

It helps separate the time-setting part from the main action.

You may sometimes see short introductory phrases without a comma in informal writing, but here the comma is standard and natural.

Yes. You could say:

• Voy a marcar el título con el subrayador amarillo antes de imprimir.

That is also correct.

The main difference is emphasis:

• Antes de imprimir, ... puts the time frame first
• ..., antes de imprimir gives the timing later

Both mean essentially the same thing.

Because título is stressed on the third-to-last syllable:

• TÍ-tu-lo

Words stressed on the third-to-last syllable in Spanish are called esdrújulas, and they always take a written accent.

That is why it is:

• título

and not titulo

For comparison:

• amarillo has no written accent because its stress pattern already follows normal rules
• imprimir also has no written accent for the same reason

So the accent in título is there to show the correct stress.