Wir befreien den Vogel aus dem Käfig.

Because the subject is wir (we), and in the present tense the verb befreien conjugates as:

• ich befreie
• du befreist
• er/sie/es befreit
• wir befreien
• ihr befreit
• sie/Sie befreien

So Wir befreien ... means We free / We are freeing ...

Because den Vogel is the direct object of the verb befreien.

The verb befreien takes an object in the accusative case: you free someone/something.

• der Vogel = the bird, as a subject
• den Vogel = the bird, as a direct object

So:

• Der Vogel fliegt. = The bird flies.
• Wir befreien den Vogel. = We free the bird.

Since Vogel is masculine, the article changes from der to den in the accusative.

Because aus always takes the dative case.

The noun Käfig is masculine:

• nominative: der Käfig
• accusative: den Käfig
• dative: dem Käfig

Since the phrase is aus dem Käfig (out of the cage), you need the dative form dem.

Yes. Aus is a preposition that always governs the dative.

Examples:

• aus dem Haus = out of the house
• aus der Tasche = out of the bag
• aus dem Käfig = out of the cage

This is worth memorizing: aus + dative.

It means out of the cage or from the cage.

In this sentence, it tells you the place the bird is being freed from. So the structure is:

• Wir = we
• befreien = free
• den Vogel = the bird
• aus dem Käfig = out of/from the cage

So the bird is being removed from confinement inside the cage.

No. Befreien is not separable.

That is important because many German verbs with prefixes can be separable, but be- verbs are normally inseparable.

So you say:

• Wir befreien den Vogel.

and not something like:

• Wir freien den Vogel be. ❌

The prefix be- stays attached to the verb.

This follows normal German main clause word order:

1. subject
2. conjugated verb
3. other elements

So here:

• Wir = subject
• befreien = conjugated verb in second position
• den Vogel = object
• aus dem Käfig = prepositional phrase

German main clauses usually put the finite verb in second position.

You could also move another element to the front for emphasis:

• Den Vogel befreien wir aus dem Käfig.
• Aus dem Käfig befreien wir den Vogel.

But the verb still stays in second position.

Because they are nouns, and in German all nouns are capitalized.

So:

• Vogel = bird
• Käfig = cage

This is a general rule in German, not something special about this sentence.

Yes, but the meaning shifts slightly.

• befreien = to free, liberate, set free
• retten = to rescue, save

In many contexts both can work, but befreien emphasizes releasing the bird from confinement, while retten emphasizes saving it from danger.

So:

• Wir befreien den Vogel aus dem Käfig. = We free the bird from the cage.
• Wir retten den Vogel aus dem Käfig. = We rescue the bird from the cage.

Normally, in standard written German, aus dem stays aus dem.

Unlike some common contractions such as:

• in dem → im
• an dem → am
• zu dem → zum

there is no standard contraction of aus dem that you should use in normal writing.

You may hear colloquial forms in speech, but for learners, aus dem is the correct standard form to use.

A common past-tense version is the Perfekt:

• Wir haben den Vogel aus dem Käfig befreit. = We freed / have freed the bird from the cage.

Here:

• haben is the auxiliary
• befreit is the past participle of befreien

You could also use the simple past, though it is less common in everyday spoken German:

• Wir befreiten den Vogel aus dem Käfig.

Käfig is approximately pronounced KEH-fikh.

A few useful points:

• ä is usually pronounced like the e sound in bed or get
• the g at the end of -ig is often pronounced like a soft ch sound in standard German pronunciation

So Käfig does not sound like English cage, even though that is the meaning.

Yes. The German present tense often covers both simple present and present progressive meanings.

So Wir befreien den Vogel aus dem Käfig can mean:

• We free the bird from the cage
• We are freeing the bird from the cage

German usually does not need a separate -ing form the way English does. The exact meaning depends on context.