Comparamos el testamento abierto con el testamento ológrafo.

Because the verb is comparar (to compare), which is a regular -ar verb.

For nosotros, the present tense is:

• yo comparo
• tú comparas
• él/ella compara
• nosotros comparamos
• vosotros comparáis
• ellos comparan

So comparamos is the correct we compare form.

It can mean either one, depending on context.

For many -ar verbs, the nosotros form is the same in:

• the present indicative: we compare
• the preterite: we compared

So comparamos can mean:

• we compare
• we compared

Normally, the surrounding context tells you which meaning is intended.

In Spanish, adjectives usually come after the noun.

So:

• testamento abierto = open will
• testamento ológrafo = holographic / handwritten will

This is the normal pattern in Spanish:

• casa grande
• libro interesante
• testamento abierto

Putting the adjective before the noun is sometimes possible in Spanish, but it often changes the tone, emphasis, or meaning. In this legal phrase, the normal order is noun + adjective.

Because testamento is a masculine singular noun.

Spanish adjectives usually agree with the noun in:

• gender: masculine/feminine
• number: singular/plural

So:

• el testamento abierto
• el testamento ológrafo

If the noun were feminine, the adjective would normally change too:

• la carta abierta

But here testamento is masculine, so the adjectives stay masculine.

Spanish often repeats the article when each item is a separate noun phrase.

So:

• el testamento abierto
• el testamento ológrafo

and then:

• Comparamos el testamento abierto con el testamento ológrafo.

This is very natural, especially in careful, formal, or technical language.

You could sometimes shorten it to:

• Comparamos el testamento abierto con el ológrafo.

if the noun is clear from context. But repeating testamento makes the sentence clearer and more formal.

Because in Spanish, comparar is commonly followed by con when you compare one thing with another.

So:

• comparar algo con algo
• Comparo un texto con otro
• Comparamos el testamento abierto con el testamento ológrafo

This matches English compare X with Y.

You may also sometimes see comparar X y Y in some contexts, but comparar ... con ... is a very standard and clear structure.

Because in Spanish, only two common contractions happen with el:

• a + el = al
• de + el = del

But:

• con + el stays con el
• para + el stays para el
• por + el stays por el

So con el testamento is correct, and there is no contraction there.

Ológrafo is a legal term. In the phrase testamento ológrafo, it refers to a will that is written by the person’s own hand.

In legal English, this is often called a:

• holographic will

Even though it looks similar to English holographic, in this legal context it has nothing to do with 3D images or projection technology. It means handwritten by the testator.

So this is a specialised legal adjective, not an everyday word.

Because the stress falls on the syllable ló:

• o-ló-gra-fo

The written accent shows where the stress goes and also follows Spanish spelling rules.

Without the accent, a learner might mispronounce it. The accent tells you it is pronounced roughly like:

• oh-LO-gra-fo

Yes. In legal Spanish, testamento abierto is a standard term, not just a random combination of words.

It refers to a specific type of will recognised in legal systems such as Spain’s. Legal vocabulary often uses very fixed expressions, and this is one of them.

So it is best to learn:

• testamento abierto
• testamento ológrafo

as whole legal terms.

Yes. In fact, Spanish normally leaves it out unless there is a reason to include it.

So:

• Comparamos el testamento abierto con el testamento ológrafo.

already means We compare / We compared the open will with the holographic will.

You could say:

• Nosotros comparamos el testamento abierto con el testamento ológrafo.

but adding nosotros usually gives extra emphasis, contrast, or clarity.

A simple pronunciation guide is:

• com-pa-RA-mos el tes-ta-MEN-to a-BYER-to kon el tes-ta-MEN-to o-LO-gra-fo

A few useful pronunciation notes:

• c before o in comparamos sounds like k
• j does not appear here
• v does not appear here either
• ll does not appear here
• abierto begins with a silent h?
  No—there is no h in abierto, so just pronounce the vowel normally.
• In most of Spain, z and c before e/i have a th-like sound, but there is no such case in this sentence

The stress is mainly on:

• compaRAmos
• testaMENto
• aBIERto
• oLÓgrafo

Yes, it sounds fairly formal and especially technical/legal because of the vocabulary:

• testamento
• abierto
• ológrafo

A normal everyday conversation would not often use ológrafo unless people were specifically talking about inheritance law, wills, or legal documents.

So the grammar is completely normal Spanish, but the vocabulary is specialised.