Completamos el formulario.

Because Spanish often omits subject pronouns when the verb already shows who is doing the action.

• completamos already tells you the subject is we
• So Nosotros completamos el formulario is also correct, but nosotros is usually unnecessary unless you want emphasis or contrast

For example:

• Completamos el formulario = We complete / completed the form
• Nosotros completamos el formulario, no ellos = We completed the form, not them

Completamos can be two different tenses:

1. Present tense: we complete
2. Preterite past: we completed

This happens with many -ar verbs in the nosotros form, because the present and preterite look the same.

So by itself, Completamos el formulario can mean either:

• We complete the form
• We completed the form

You usually know from context.

Look for:

• time words
• surrounding sentences
• the situation

Examples:

• Cada semana completamos el formulario.
  = Every week we complete the form.
  -> present / habitual action

• Ayer completamos el formulario.
  = Yesterday we completed the form.
  -> past action

Without context, the sentence is ambiguous.

It comes from the infinitive completar = to complete.

It is a regular -ar verb.

For the nosotros form:

• stem: complet-
• ending: -amos

So:

• completar -> completamos

This same ending is used for:

• present nosotros
• preterite nosotros of regular -ar verbs

That is why the form looks identical in both tenses.

Because Spanish often uses the definite article el where English might simply say the.

• el = the
• formulario = form

So el formulario means the form.

In Spanish, a noun usually needs an article unless there is a specific reason to leave it out. Saying only Completamos formulario would sound incomplete or unnatural in normal usage.

Formulario means form, especially a document or screen with spaces to fill in information.

Examples:

• an application form
• an online form
• a registration form

In Spain, formulario is a normal and common word. Depending on context, people might also talk about:

• solicitud = application
• impreso = printed form, paper form
• cuestionario = questionnaire

But formulario is the straightforward general word here.

Yes — and in Spain, that is often very natural.

Both are correct, but they can feel slightly different:

• completar un formulario = to complete a form
• rellenar un formulario = to fill in a form

In everyday Peninsular Spanish, rellenar un formulario is extremely common when you mean filling in the boxes or spaces with information.

So in Spain, many people would naturally say:

• Rellenamos el formulario

while Completamos el formulario is still perfectly correct.

A simple pronunciation guide is:

kom-pleh-TA-mos el for-moo-LA-rio

Stress:

• completamos -> stress on ta
• formulario -> stress on la

A few pronunciation notes for Spain:

• c before o sounds like k, so completamos starts with a k sound
• r in formulario is a tapped Spanish r
• the vowels are pure and short: o, e, a, o

The neutral, most common order is:

• Completamos el formulario

That is:

• verb + object

But Spanish word order is more flexible than English. You can change it for emphasis, although the basic version is best for learners.

For example:

• El formulario lo completamos nosotros
  = We are the ones who complete the form

That sounds more emphatic. The original sentence is the normal, straightforward version.

Yes, often.

In Spain, speakers frequently use the present perfect for past actions that feel connected to the present, especially with time periods that are still current.

So depending on context, a person in Spain might say:

• Hemos completado el formulario = We have completed the form

instead of:

• Completamos el formulario = We completed the form

Very roughly:

• completamos = simple past / preterite
• hemos completado = have completed

Both are correct, but in Spain the present perfect is often more common than in many Latin American varieties for recent or still-relevant past actions.

It is neutral.

Nothing in Completamos el formulario is especially formal or especially informal. It could fit many situations:

• at work
• at school
• in an office
• during an online registration process

If you wanted a more formal style in writing, you might choose a more formal surrounding context, but the sentence itself is standard and natural.