Cuando trabajamos en grupo, nos ponemos de acuerdo enseguida porque Laura es generosa con sus ideas.

Because the sentence describes a general present habit, Spanish uses the present indicative: trabajamos.

• trabajamos = we work / we are working, depending on context
• trabajábamos would mean we used to work / we were working
• trabajemos is subjunctive and does not fit this structure
• trabajaremos would mean we will work

After cuando, Spanish often uses the present indicative for repeated or habitual actions:

• Cuando estudio, apago el móvil
• Cuando comemos fuera, pedimos tapas

Ponerse de acuerdo is a fixed expression meaning to reach an agreement, to agree with each other, or to get on the same page.

It is best learned as a whole chunk rather than word by word. Literally, it looks like to put oneself in agreement, but that literal version is not how English normally says it.

Very common examples:

• Nos pusimos de acuerdo rápido
• ¿Habéis llegado ya a un acuerdo?
• Tenemos que ponernos de acuerdo

Because ponerse de acuerdo is a pronominal expression. The nos matches the subject nosotros and shows that we are the ones reaching agreement among ourselves.

So:

• me pongo de acuerdo = I reach an agreement
• te pones de acuerdo = you reach an agreement
• nos ponemos de acuerdo = we reach an agreement

Without nos, ponemos de acuerdo would sound incomplete or wrong here.

This is a very common question.

• ponerse de acuerdo = to come to an agreement, focusing on the process of reaching it
• estar de acuerdo = to agree, focusing on the state of already being in agreement

So in this sentence, nos ponemos de acuerdo enseguida means the group quickly reaches agreement.

Compare:

• Siempre nos ponemos de acuerdo enseguida = We always come to an agreement quickly
• Ya estamos de acuerdo = We already agree / We are already in agreement

Enseguida means right away, very quickly, or straight away.

It tells you how fast the group reaches agreement. In Spain, enseguida is very common in everyday speech.

Its position is flexible:

• Nos ponemos de acuerdo enseguida
• Enseguida nos ponemos de acuerdo

Both are natural, though the original order sounds very standard.

Because porque is the conjunction meaning because, and it introduces a reason.

• porque = because
• por qué = why

So here:

• ...porque Laura es generosa... = ...because Laura is generous...

A quick contrast:

• ¿Por qué llegas tarde? = Why are you late?
• Llego tarde porque hay tráfico = I am late because there is traffic

Because ser is used for a characteristic or personal quality, and here generosa describes Laura as a person.

• es generosa = she is generous as a trait
• está generosa would suggest a more temporary or unusual state, something like she’s being generous today

In this sentence, the idea is that Laura is the kind of person who shares her ideas freely, so es is the natural choice.

The adjective generoso/a often goes with con when you say what someone is generous with:

• generoso con su tiempo
• generosa con el dinero
• generosa con sus ideas

So con is the normal preposition here.

Sus refers to Laura’s ideas. One important point: Spanish possessives agree with the thing possessed, not with the owner. Since ideas is plural, the sentence uses sus.

So:

• su idea = her idea
• sus ideas = her ideas

You cannot tell from su/sus alone whether the owner is male or female; the context tells you it is Laura.

Because Cuando trabajamos en grupo is an introductory subordinate clause. In Spanish, when that kind of clause comes first, it is very normal to separate it from the main clause with a comma.

So:

• Cuando trabajamos en grupo, nos ponemos de acuerdo enseguida...

This works much like English:

• When we work in a group, we quickly agree...

If the order were reversed, the comma would often disappear:

• Nos ponemos de acuerdo enseguida cuando trabajamos en grupo