La persona adoptante confirma la adopción.

Because persona is a grammatically feminine noun in Spanish, no matter the actual sex or gender of the person being referred to.

So you say:

• la persona adoptante = the adopting person

Even if that person is a man, Spanish still uses la persona. Grammatical gender and real-life gender do not always match.

Because adoptante is one of many Spanish words ending in -nte that usually keep the same form for masculine and feminine.

So you can have:

• el adoptante
• la adoptante
• la persona adoptante

The article or surrounding words show the gender when needed, not the ending of adoptante itself.

Here it is functioning like an adjective modifying persona:

• la persona adoptante = the adopting person

But in legal or formal language, adoptante can also be used as a noun by itself:

• el adoptante
• la adoptante

So it can behave as either a noun or an adjective depending on the sentence.

Confirma is the third-person singular present indicative form of confirmar.

It matches the subject la persona adoptante, which is singular:

• la persona adoptante confirma

If the subject were plural, you would use confirman:

• las personas adoptantes confirman la adopción

And confirmar is the infinitive, so it would not work as the main finite verb in this sentence.

Because la adopción is a specific noun here and it is the direct object of the verb confirma.

In Spanish, articles are often used where English might omit them. In this sentence, la adopción sounds natural and complete. Without the article, confirma adopción, it would sound unnatural in normal sentence grammar, though something like that might appear in a heading or very compressed bureaucratic style.

The correct noun from adoptar is adopción.

This is just the standard word formation:

• adoptar = to adopt
• adopción = adoption

Spanish does not form this noun as adoptación. This is something learners usually just need to memorise.

Because the stress falls on the last syllable: -ción.

Words ending in a vowel, n, or s are normally stressed on the second-to-last syllable. Since adopción ends in n but is stressed on the last syllable, it needs a written accent:

• a-dop-ción

This is very common with nouns ending in -ción, such as:

• información
• decisión
• confirmación

The normal, neutral order is:

• La persona adoptante confirma la adopción.

That is the most natural choice in ordinary Spanish prose.

Spanish word order is somewhat flexible, but changing it usually adds emphasis or sounds more formal, literary, or marked. For example:

• La adopción la confirma la persona adoptante.

This is possible, but it is not the most neutral version. For learners, the original order is the safest and most natural.

If the subject becomes plural, both the article, the noun, the modifier, and the verb must agree:

• Las personas adoptantes confirman la adopción.

If both subject and object are plural:

• Las personas adoptantes confirman las adopciones.

This is a good example of Spanish agreement working across the sentence.

In standard Peninsular Spanish, a rough pronunciation would be:

• La persona adoptante confirma la adopción
• la per-SO-na a-dop-TAN-te kom-FIR-ma la a-dop-THYON

A few useful pronunciation points:

• c in confirma is pronounced like k because it comes before o
• c in adopción comes before i, so in most of Spain it is pronounced like th in thin
• ción is stressed on the last syllable

So in much of Spain, adopción sounds roughly like a-dop-THYON.

Yes. That is also possible, especially in legal or administrative language.

For example:

• El adoptante confirma la adopción.
• La adoptante confirma la adopción.

Using la persona adoptante can sound more neutral, inclusive, or formal, especially when the text wants to refer to the role rather than highlight whether the person is male or female.