Preparamos un simulacro para esta contingencia.

It can mean either one.

In Spanish, preparamos can be:

• present tense: we prepare
• preterite (simple past): we prepared

So by itself, Preparamos un simulacro para esta contingencia is ambiguous.

You need context to know which meaning is intended. For example:

• Cada año preparamos un simulacro para esta contingencia.
  = Every year we prepare a drill for this contingency.
  → present/habitual meaning

• Ayer preparamos un simulacro para esta contingencia.
  = Yesterday we prepared a drill for this contingency.
  → past meaning

This is very normal in Spanish.

Because Spanish often drops the subject pronoun when it is clear from the verb ending.

• preparamos already tells you the subject is nosotros/nosotras = we

So Spanish usually says:

• Preparamos un simulacro...

instead of:

• Nosotros preparamos un simulacro...

Using nosotros is possible, but it is usually only added for:

• emphasis
• contrast
• clarity

For example:

• Nosotros preparamos el simulacro, pero ellos lo ejecutan.
  = We prepare the drill, but they carry it out.

Here, simulacro means a drill, practice exercise, or simulation, especially for emergencies or risk situations.

Common examples:

• simulacro de incendio = fire drill
• simulacro de evacuación = evacuation drill

So in this sentence, un simulacro is not just any imitation. It usually suggests a planned practice scenario to prepare for a real event.

In Spain, this is a very common word in schools, workplaces, hospitals, and emergency planning.

Because simulacro is a masculine noun.

• el simulacro
• un simulacro

Even though noun gender sometimes feels predictable, you still have to learn it with the noun. Here it is masculine.

Examples:

• El simulacro fue útil.
• Hicimos un simulacro ayer.

Because contingencia is a feminine noun.

So it takes feminine forms:

• la contingencia
• una contingencia
• esta contingencia

Not:

• este contingencia

This is because nouns ending in -encia are normally feminine:

• la emergencia
• la paciencia
• la diferencia
• la contingencia

Contingencia is a somewhat formal word. It usually means:

• a contingency
• an unexpected situation
• an emergency scenario
• a possible risk situation that you prepare for

In practical contexts, it often refers to something that might happen and requires a plan.

So para esta contingencia suggests something like:

• for this possible emergency
• for this contingency situation
• for this risk scenario

Depending on the context, a more everyday Spanish word might be:

• emergencia
• problema
• situación

But contingencia sounds natural in technical, institutional, safety, or planning language.

Para is used because it expresses purpose or intended use.

So:

• Preparamos un simulacro para esta contingencia
  = We prepared / prepare a drill for this contingency

The idea is: the drill is meant for dealing with that situation.

Compare:

• para = for, in order to deal with, intended for
• por usually has other meanings, such as because of, through, by, for the sake of, etc.

Here, por esta contingencia would not sound right if you mean the drill is designed for that situation.

Yes. Spanish word order is often more flexible than English word order.

For example, these are possible:

• Preparamos un simulacro para esta contingencia.
• Para esta contingencia, preparamos un simulacro.

Both are grammatical.

The second version puts more emphasis on para esta contingencia. It sounds a bit like:

• For this contingency, we prepared a drill.

The original version is the most neutral.

Because un introduces something non-specific or not previously identified.

• un simulacro = a drill
• el simulacro = the drill

So the sentence presents it as a drill, not necessarily one already known to the listener.

Compare:

• Preparamos un simulacro para esta contingencia.
  = We prepared a drill for this contingency.

• Preparamos el simulacro para esta contingencia.
  = We prepared the drill for this contingency.
  → this suggests a specific drill already known in the conversation

Yes, it is natural, especially in formal, technical, or institutional Spanish.

It sounds suitable in contexts like:

• workplace safety
• emergency planning
• civil protection
• business continuity
• schools or hospitals

That said, contingencia sounds more formal than everyday speech. In casual conversation, a speaker might choose a more common word depending on the situation, such as:

• emergencia
• problema
• situación

For example:

• Preparamos un simulacro para esta emergencia.
• Preparamos un simulacro por si pasa algo así.

But the original sentence is perfectly good Spanish.

Usually from the context, time expressions, or the surrounding sentences.

Spanish speakers are very used to this kind of ambiguity when a form is the same in two tenses.

Clues can come from words like:

• ayer = yesterday
• la semana pasada = last week
• cada año = every year
• normalmente = normally
• ahora = now

Examples:

• Ayer preparamos un simulacro para esta contingencia.
  → definitely past

• Siempre preparamos un simulacro para esta contingencia.
  → present/habitual

Without context, both readings are possible.