La posición cambió.

It is a simple subject + verb sentence:

• la posición = the subject
• cambió = the verb

So grammatically, it works like The position changed.

Because posición is a feminine noun in Spanish, so it takes the feminine singular article la.

• la posición
• not el posición

This is something you usually just learn together with the noun: la posición.

Spanish uses accent marks to show which syllable is stressed when it does not follow the default stress pattern.

posición is stressed on the last syllable:
po-si-CIÓN

Words ending in -n, -s, or a vowel are normally stressed on the second-to-last syllable, so posición needs the written accent to show that the stress is different.

Cambió is the preterite of cambiar.

Specifically, it is:

• third person singular
• preterite
• from cambiar = to change

So it can mean:

• he changed
• she changed
• it changed

In this sentence, it means it changed, because la posición is the subject.

Because cambió presents the change as a completed event.

• cambió = changed
• cambiaba = was changing / used to change / changed repeatedly, depending on context

So:

• La posición cambió = the position changed
• La posición cambiaba would suggest an ongoing, repeated, or background action, which is a different idea

The accent mark shows both stress and verb form.

• cambio = I change / change
• cambió = he/she/it changed

So the accent is important because it changes the meaning and pronunciation.

• CAM-bio → cambio
• cam-BIÓ → cambió

You could, but it may mean something different.

• La posición cambió clearly means The position changed.
• Cambió la posición is often understood as He/She/It changed the position.

Why? Because Spanish allows the subject to be omitted, so cambió by itself can already mean he/she/it changed, and then la posición can sound like the object.

So putting la posición first makes the intended meaning much clearer.

Yes. That is also correct, but the nuance is different.

• La posición cambió = the position changed
• La posición ha cambiado = the position has changed

In Spain, the present perfect (ha cambiado) is often used for a past action that still feels connected to the present, especially with recent time references. The preterite (cambió) sounds more like a completed past event.

In standard Peninsular Spanish, approximately:

la po-si-THYON kam-BYOH

More precisely:

• la
• posición → stress on the last syllable
• cambió → stress on the last syllable

A few pronunciation notes:

• In most of Spain, the c before i in posición sounds like th in think
• The c in cambió sounds like k
• The ll-type sound is not involved here; ió is just part of the verb ending

No. Posición can be used in several ways, depending on context, for example:

• physical position: the position of an object
• place/ranking: first position, second position
• stance/viewpoint: someone’s position on an issue
• job/post in some contexts

So the exact meaning depends on what the sentence is about, even though the grammar stays the same.

The infinitive is cambiar.

Preterite forms:

• yo cambié = I changed
• tú cambiaste = you changed
• él/ella/usted cambió = he/she/it/you changed
• nosotros cambiamos = we changed
• vosotros cambiasteis = you all changed
• ellos/ellas/ustedes cambiaron = they/you all changed

So in La posición cambió, the form used is the él/ella/usted form, agreeing with the singular subject la posición.