Después del examen, me quedo en silencio un momento para respirar hondo.

Because de + el contracts to del in Spanish.

• después de el examen → después del examen

This contraction is required with el.
It does not happen with la:

• después de la clase
• después de la comida

A similar very common contraction is a + el = al.

Después de means after.

In this sentence, it is followed by a noun phrase:

• después del examen = after the exam

Spanish uses después de before nouns and infinitives:

• después del examen = after the exam
• después de comer = after eating / after I eat

So the de is a normal part of the expression después de.

Here, quedarse means something like to stay, to remain, or to become/stay in a state depending on context.

In this sentence:

• me quedo en silencio = I stay/remain silent or I fall silent for a moment

The verb is used in a pronominal form: quedarse.

Present tense:

• me quedo
• te quedas
• se queda
• nos quedamos
• os quedáis
• se quedan

So me quedo literally means I stay/remain.

Not exactly in the literal English sense of a reflexive action like I wash myself.

In me quedo, the me is part of the pronominal verb quedarse. It often does not mean a separate object like myself in natural English translation.

Compare:

• quedar can mean things like to arrange, to be left, to fit, depending on context
• quedarse often means to stay, to remain, to end up, or to become

So here, you should learn quedarse en silencio as a useful pattern rather than trying to translate me word-for-word.

Because Spanish often uses en + noun to express a state or manner.

• en silencio = in silence / silently

This is a very common expression. It sounds natural and idiomatic.

Examples:

• Se quedó en silencio. = He/She fell silent.
• Esperamos en silencio. = We waited in silence.

Using silencioso here would not sound natural in the same way. You would not normally say me quedo silencioso for this meaning.

Un momento means for a moment or a moment.

Here it tells us the duration of the action:

• me quedo en silencio un momento = I stay silent for a moment

Spanish often uses a bare time expression without a preposition where English uses for:

• Esperé una hora. = I waited for an hour.
• Calla un segundo. = Be quiet for a second.

So un momento works naturally without adding por here.

Because Spanish often omits a preposition before expressions of duration.

English says:

• for a moment
• for an hour

Spanish often simply says:

• un momento
• una hora

So:

• me quedo en silencio un momento literally looks like I stay in silence a moment, but naturally it means I stay silent for a moment.

Para + infinitive usually expresses purpose: in order to / so as to.

So:

• para respirar hondo = to take a deep breath / in order to breathe deeply

It explains why the speaker stays silent for a moment.

Structure:

• para = in order to / to
• respirar = to breathe
• hondo = deeply / deep

Because respirar hondo is a very common idiomatic expression in Spanish.

It literally looks like to breathe deep, but it naturally means:

• to breathe deeply
• to take a deep breath

You may also hear:

• respira hondo = take a deep breath
• respiró hondo = he/she took a deep breath

While respirar profundamente is grammatically possible, respirar hondo is much more common and natural in everyday speech.

It can match either one depending on context, but in this sentence to take a deep breath is often the most natural English translation.

• me quedo en silencio un momento para respirar hondo
  = I stay silent for a moment to take a deep breath

If the context were about a more continuous action, breathe deeply could also fit.

The present tense can describe:

• something habitual: After the exam, I stay silent for a moment...
• something vivid/narrative: telling an event as if it is happening now
• a general personal routine

Without more context, me quedo most naturally sounds like a habitual or general statement.

If you wanted a one-time past event, you might say:

• Después del examen, me quedé en silencio un momento para respirar hondo.
• After the exam, I stayed silent for a moment to take a deep breath.

No, not in normal Spanish.

You need the article here:

• después del examen

Spanish usually uses the article with specific nouns like this.
Examen here refers to the exam, a specific event already understood in context.

So después de examen sounds incomplete or unnatural.

The structure is:

• Después del examen = time expression
• me quedo = main verb
• en silencio = state/manner
• un momento = duration
• para respirar hondo = purpose

So the full pattern is:

After the exam, I remain/stay silent for a moment in order to take a deep breath.

Spanish word order is fairly flexible, but this version sounds natural and clear.

Yes, to some extent. Spanish allows some flexibility, especially with time expressions and purpose phrases.

For example:

• Me quedo en silencio un momento después del examen para respirar hondo.
• Después del examen, un momento me quedo en silencio para respirar hondo. ← grammatical, but less natural
• Después del examen, me quedo un momento en silencio para respirar hondo.

The original sentence is very natural because it presents the context first, then the action, then the reason.

Yes, definitely.

Quedarse en silencio is a very useful and common expression meaning:

• to fall silent
• to remain silent
• to go quiet

Examples:

• Todos se quedaron en silencio. = Everyone fell silent.
• Me quedé en silencio porque no sabía qué decir. = I went quiet because I didn’t know what to say.

It is worth learning as a chunk rather than translating each word separately every time.

A very literal version would be:

• After the exam, I stay myself in silence a moment in order to breathe deep.

That is not natural English, but it helps show the Spanish structure:

• Después del examen = after the exam
• me quedo = I remain/stay
• en silencio = in silence
• un momento = a moment
• para respirar hondo = in order to breathe deep / take a deep breath

A natural English version would be:

• After the exam, I stay silent for a moment to take a deep breath.