Preparan la inyección.

Preparan is the 3rd person plural form of preparar in the present indicative.

So it can mean:

• they prepare
• they are preparing (depending on context)

In standard verb tables:

• yo preparo
• tú preparas
• él/ella prepara
• nosotros/as preparamos
• vosotros/as preparáis
• ellos/ellas preparan

So in this sentence, preparan matches ellos/ellas.

Spanish often leaves out subject pronouns when the verb ending already shows who the subject is.

So instead of saying:

• Ellos preparan la inyección

Spanish commonly just says:

• Preparan la inyección

This is very natural. The subject is understood from preparan.

In English, you usually need a subject like they, but Spanish does not.

In most cases in Spain Spanish, preparan will be understood as they prepare / they are preparing.

However, grammatically it can also match ustedes:

• Ustedes preparan la inyección

But in Spain, ustedes is mainly used in formal plural situations, and vosotros preparáis is the normal informal plural form.

So for a learner of Spanish from Spain, the most likely reading of Preparan la inyección is simply:

• They prepare / They are preparing the injection

La means the, while una means a/an.

So:

• la inyección = the injection
• una inyección = an injection

Spanish uses the definite article when the speaker has a specific injection in mind, or when the context already makes it clear which one is being talked about.

For example, in a medical setting, if everyone knows which injection is meant, la inyección sounds natural.

Because la inyección is the direct object of the verb preparan.

The basic word order here is:

• Verb + object
• Preparan la inyección

Spanish often uses Subject + Verb + Object, but since the subject is omitted here, you just see:

• [They] prepare the injection

So the hidden structure is basically:

• (Ellos/Ellas) preparan la inyección

Yes. Spanish present tense often covers both:

• they prepare
• they are preparing

So Preparan la inyección could describe:

• a general action, or
• something happening now

Context decides which one sounds best in English.

If Spanish wants to be more explicitly progressive, it can also say:

• Están preparando la inyección = They are preparing the injection

Both are possible, though están preparando puts more emphasis on the action being in progress right now.

Not necessarily more natural, just more specific.

• Preparan la inyección = simple present; can be general or current depending on context
• Están preparando la inyección = clearly focuses on the action in progress

Spanish uses the simple present more flexibly than English does, so Preparan la inyección is perfectly normal.

Yes, inyección is the standard word for injection.

In English, people often say:

• injection
• shot
• jab (especially in British English)

In Spanish, inyección is the normal literal word. In everyday context, it can refer to a medical shot, vaccine injection, or similar.

The accent mark shows where the stress goes:

• in-yec-CIÓN

The stressed syllable is the last one: -ción.

Also, many Spanish nouns ending in -ción have an accent mark, for example:

• nación
• información
• inyección

This is very common and worth getting used to.

It is feminine, which is why it uses la:

• la inyección

Many Spanish nouns ending in -ción are feminine:

• la lección
• la canción
• la situación
• la inyección

So la inyección follows a very common pattern.

A simple approximate pronunciation is:

• preh-PAH-ran la in-yehk-THYON

In most of Spain, the c before i in inyección is pronounced like th in thin:

• inyec-ción → in-yek-THYON

If you want the stress:

• pre-PA-ran la in-yec-CIÓN

The strongest stress is on:

• pa in preparan
• ción in inyección

Yes. Since la inyección is a feminine singular direct object, you can replace it with la:

• Preparan la inyección → La preparan

This means:

• They prepare it
• They are preparing it

This is very common in Spanish once the object is already known from context.