Después de terminar de imprimir, puse las grapas en la grapadora y guardé el informe en la carpeta.

Because después de + infinitive is a very common Spanish structure meaning after doing something.

So:

• después de terminar de imprimir = after finishing printing

This is different from:

• después terminé de imprimir = afterwards, I finished printing

In the sentence you were given, después de terminar de imprimir is an introductory time expression that sets up what happened next.

A useful pattern is:

• después de + infinitive when the subject is the same
• después de que + finite verb when you need a full clause

For example:

• Después de comer, salí. = After eating, I went out.
• Después de que comí, salí. = After I ate, I went out.

Both can work, but después de + infinitive is very natural and compact.

Because they belong to two different structures:

1. después de = after
2. terminar de + infinitive = to finish doing something

So:

• después de
  • terminar de imprimir

Breakdown:

• después de = after
• terminar de imprimir = to finish printing

The second de is required because terminar de is the normal pattern before another verb.

Compare:

• Terminé de leer el libro. = I finished reading the book.
• Terminó de trabajar a las seis. = He/She finished working at six.

So the double de is not strange in Spanish; it just happens because two separate structures meet.

Spanish often uses the infinitive where English uses a gerund (-ing form).

So English says:

• after printing
• finish printing

But Spanish says:

• después de imprimir
• terminar de imprimir

In other words, Spanish likes the infinitive after many prepositions and verb patterns.

Some similar examples:

• antes de salir = before leaving
• sin hablar = without speaking
• empezó a llorar = she/he started crying
• dejó de fumar = she/he stopped smoking

So imprimir is exactly what you would expect in Spanish grammar here.

They are in the preterite because the sentence describes completed actions in sequence.

The speaker is telling you what they did:

1. finished printing
2. put the staples in the stapler
3. put away the report in the folder

These are single, completed actions, so the preterite is the natural tense:

• puse = I put
• guardé = I put away / stored / saved

If the sentence were describing background, habits, or an ongoing situation, the imperfect might be used instead. But here the actions move the story forward, so the preterite fits best.

Because poner is irregular in the preterite.

Its preterite forms are:

• puse
• pusiste
• puso
• pusimos
• pusisteis
• pusieron

So:

• yo puse = I put

This is a very common irregular verb, so it is worth memorising.

A useful thing to notice: poner follows the same kind of preterite pattern as several other irregular verbs:

• tener → tuve
• estar → estuve
• poder → pude
• saber → supe

So puse is just the correct irregular past form of poner.

Spanish uses definite articles more often than English does.

In English, you might say:

• I put staples in the stapler and put the report in the folder

In Spanish, using the articles sounds natural:

• puse las grapas en la grapadora
• guardé el informe en la carpeta

The articles often appear when the objects are understood from context or are specific in the situation.

Spanish also tends to use articles where English sometimes uses no article or uses a possessive. For example:

• Me duele la cabeza. = My head hurts.
• Abrí la puerta. = I opened the door.

So the articles here do not sound unusually heavy to a Spanish speaker; they are normal.

They are two different but related words:

• grapas = staples
• grapadora = stapler

So:

• las grapas are the little metal pieces
• la grapadora is the tool that uses them

This pair is helpful to remember because the meanings are easy to confuse at first.

You can think of grapadora as the device associated with grapar (to staple).

Yes. In context, it means I loaded the stapler with staples.

That is understandable and natural enough. A Spanish speaker would interpret it as putting staples into the stapler so it can be used.

You might also hear other natural versions, such as:

• Puse grapas en la grapadora.
• Cargué la grapadora con grapas.

The version in your sentence is perfectly clear. The use of las grapas suggests particular staples already being referred to or simply a definite set in the situation.

Here guardé means something like I put away, I stored, or I filed the report in the folder.

The verb guardar has a broad meaning:

• to keep
• to put away
• to store
• to save

So the exact English translation depends on context.

In this sentence:

• guardé el informe en la carpeta

the most natural idea is that the speaker physically placed the report into a folder.

If the context were digital, guardar could also mean to save a file, and carpeta could mean a computer folder. But with el informe and the rest of the sentence, a physical office setting is the most likely reading.

Because Spanish usually omits subject pronouns when they are not needed.

The verb endings already tell you the subject:

• puse = I put
• guardé = I put away / stored

So yo is unnecessary unless the speaker wants emphasis, contrast, or clarity.

For example:

• Puse las grapas... = normal, neutral
• Yo puse las grapas, no Marta. = I put the staples in, not Marta

This omission of subject pronouns is one of the most common differences from English.

The comma separates the introductory time phrase from the main part of the sentence:

• Después de terminar de imprimir, puse...

This is similar to English:

• After finishing printing, I put...

In Spanish, a comma is commonly used after a longer introductory phrase like this. It helps readability and makes the structure clearer.

With a very short introductory phrase, commas are sometimes omitted, but here the comma is completely natural.