As fotos comprovam a avaria.

Because as is the feminine plural definite article, meaning the.

• a foto = the photo
• as fotos = the photos

Portuguese articles change for gender and number, so as is used because fotos is:

• feminine
• plural

Foto is feminine because it is a shortened form of fotografia, which is feminine.

So even though the word ends in -o, it is still feminine:

• a foto
• as fotos

This is a useful exception, since learners often expect words ending in -o to be masculine.

Because the verb has to agree with the subject, which is as fotos.

• a foto comprova = the photo proves
• as fotos comprovam = the photos prove

So:

• comprova = third person singular
• comprovam = third person plural

Since fotos is plural, comprovam is correct.

The infinitive is comprovar, which means to prove, to confirm, or to verify with evidence.

This sentence uses the present indicative:

• eu comprovo
• você/ele/ela comprova
• nós comprovamos
• vocês/eles/elas comprovam

Here, comprovam matches as fotos.

Not exactly.

Comprovar usually means:

• to prove
• to demonstrate with evidence
• to confirm

It often sounds a bit more formal or documentary.

Provar can also mean to prove, but it has other meanings too, such as:

• to try on clothes
• to taste food

So in a sentence about evidence, documents, reports, or photos, comprovar is often the more precise choice.

Avaria usually refers to damage, breakage, a fault, or damage to goods/equipment/vehicles.

It is common in contexts like:

• shipping
• insurance
• transport
• inspections
• technical reports

Compared with dano, avaria often sounds more specific or technical, especially for physical damage to an object, product, vehicle, or shipment.

Here, a is the feminine singular definite article, meaning the.

• a avaria = the damage

It is used because the sentence refers to a specific damage or fault, not just damage in a general sense.

So the structure is:

• As fotos = the subject
• comprovam = the verb
• a avaria = the object

Without the article, the sentence would sound less natural in most ordinary contexts.

It is understandable in everyday Portuguese, but it tends to sound more formal, technical, or official than some other words.

You are especially likely to hear it in:

• insurance claims
• delivery complaints
• repair reports
• customer service
• vehicle or cargo inspections

In very casual speech, Brazilians might sometimes use other words depending on the context, such as:

• dano
• defeito
• problema
• estrago

But avaria is completely natural in the right context.

Yes, but the original order is the most straightforward and natural:

• As fotos comprovam a avaria.

This is a normal subject + verb + object sentence.

Other versions are possible, for example:

• A avaria é comprovada pelas fotos.
  Passive voice: The damage is proven by the photos.

• São as fotos que comprovam a avaria.
  More emphasis on the photos.

The original sentence is the clearest neutral version.

You would say:

• A foto comprova a avaria.

That means The photo proves the damage.

Notice the changes:

• as fotos → a foto
• comprovam → comprova

Everything changes to singular to match foto.

In Brazilian Portuguese, avaria is pronounced roughly like ah-vah-REE-ah, with the stress on ri.

So the stress pattern is:

• a-va-RI-a

And comprovam is roughly kom-PRO-vam, with the stress on pro.

Knowing the stress helps a lot, because Portuguese pronunciation often depends on it.