El formulario incluye el sexo de la persona.

In Spanish, articles like el, la, los, and las are used more often than in English.

So El formulario incluye... sounds natural as The form includes...

If you said just Formulario incluye..., it would usually sound incomplete or unnatural unless it were a heading, label, or very telegraphic style.

Incluye is the third-person singular present tense of the verb incluir, which means to include.

So:

• yo incluyo = I include
• tú incluyes = you include
• él / ella / usted incluye = he / she / you include

Here, the subject is El formulario, which is singular, so incluye is the correct form.

Because the subject is singular: El formulario = the form.

• El formulario incluye... = The form includes...
• Los formularios incluyen... = The forms include...

Spanish verbs change depending on whether the subject is singular or plural.

In Spanish, every noun has a grammatical gender. Sexo is a masculine noun, so it takes el:

• el sexo

This grammatical gender does not mean the thing itself is masculine in meaning. It is just how the noun behaves grammatically.

In this sentence, sexo usually means biological sex or the category asked for on a form.

In Spain, sexo is still very common in official or administrative language for forms. However, in some contexts, especially more modern or socially sensitive ones, you may also see género.

So:

• sexo = usually biological sex
• género = gender

On a real form, which word is used depends on the institution and the purpose.

De la persona means of the person.

So el sexo de la persona literally means the sex of the person.

Spanish often uses this kind of noun + de + noun structure to make things clear and precise.

You could say su sexo, but that can be more ambiguous because su can mean:

• his
• her
• your
• their

In formal or administrative language, de la persona often sounds clearer.

Because persona is a feminine noun, so it uses la:

• la persona

After de, you get:

• de la persona = of the person

You only get del when de + el combine:

• de + el = del

For example:

• del formulario = of the form

But since this sentence has la persona, it must be de la persona.

Because persona is always a grammatically feminine noun in Spanish, regardless of whether the actual person is male, female, or another gender.

So you say:

• la persona
• una persona

Even if you are talking about a man, you still say la persona.

This is a very common point for English speakers: grammatical gender and real-life gender are not always the same thing.

The structure is:

El formulario + incluye + el sexo de la persona

That is:

• subject = El formulario
• verb = incluye
• direct object = el sexo de la persona

So Spanish is using the same basic order as English here: subject + verb + object.

In Spain, incluye is pronounced approximately like in-KLOO-yeh.

A rough guide:

• in = like English een but shorter
• clu = kloo
• ye = yeh

So: in-KLOO-yeh

The y sound in incluye is important. It is not pronounced like English includes.

No, there are no written accent marks in El formulario incluye el sexo de la persona.

That is because the words already follow normal Spanish stress rules:

• formulario
• incluye
• sexo
• persona

Spanish only adds a written accent when the stress does not follow the usual pattern or when it is needed to distinguish words.

Sometimes, yes. Depending on context, incluye can be translated as:

• includes
• contains

But includes is usually the closest and most direct translation of incluir.

So in this sentence, includes is the best match.