Representamos al grupo.

It is the first-person plural form of representar.

So in the present indicative, representamos means we represent.

The ending -amos is the normal nosotros/nosotras ending for regular -ar verbs in the present tense.

Yes. This form is ambiguous on its own.

Representamos can mean either:

• we represent (present)
• we represented (preterite / simple past)

Context usually makes it clear:

• Hoy representamos al grupo. = Today we represent the group.
• Ayer representamos al grupo. = Yesterday we represented the group.

Because Spanish often drops subject pronouns when they are already clear from the verb ending.

Representamos already tells you the subject is we, so nosotros is not necessary.

You can add it for emphasis or contrast:

• Nosotros representamos al grupo, no ellos. = We represent the group, not them.

Because Spanish often uses the personal a before a direct object that refers to people or a group of people.

Here, grupo refers to a group of people, so a is used.

Since a + el contracts, you get:

• a + el grupo = al grupo

If you said representamos el grupo, it would sound different or unnatural in this meaning. It could suggest something more like we portray the group or we depict the group, depending on context.

Al is the contraction of a + el.

This contraction is mandatory in Spanish.

So:

• a el grupo → al grupo

Compare:

• al profesor = a + el profesor
• a la profesora = no contraction
• a los estudiantes = no contraction
• a él = no contraction, because él is a pronoun, not the article el

El grupo means the group: a specific group that the speaker and listener already know about.

If you said un grupo, it would mean a group, without identifying which one.

So:

• Representamos al grupo. = We represent the group.
• Representamos a un grupo. = We represent a group.

Yes. Representar is a regular -ar verb.

Its present-tense forms are:

• yo represento
• tú representas
• él/ella/usted representa
• nosotros/nosotras representamos
• vosotros/vosotras representáis
• ellos/ellas/ustedes representan

Since you are learning Spanish from Spain, it is especially useful to notice vosotros representáis.

Yes. Spanish word order is fairly flexible.

The neutral, normal version is:

• Representamos al grupo.

But you could also say:

• Nosotros representamos al grupo. — adds emphasis to we
• Al grupo lo representamos nosotros. — stronger emphasis or contrast

That last version is more marked and would be used in a specific context, not as the most neutral sentence.

Often yes, but not always in every context.

Representar can mean things like:

• to represent someone or a group
• to stand for
• to symbolize
• to portray

A common learner mistake is confusing representar with presentar:

• representar = to represent
• presentar = to present / to introduce

So Representamos al grupo is about acting on behalf of or speaking for the group, not introducing it.