La meva mare començarà una reunió a l'oficina, i acabarà abans de dinar.

In Catalan, a possessive usually goes together with the definite article:

• la meva mare = my mother
• el meu pare = my father

That is different from English, which normally says just my mother, without the.

This article + possessive pattern is very common in Catalan, especially with family members. The article may be left out in a few special cases, such as direct address, but la meva mare is the normal form here.

Catalan often leaves out subject pronouns because the verb ending already shows the person.

• començarà = he/she/it will start
• acabarà = he/she/it will finish

So ella is not necessary. If you add ella, it usually gives extra emphasis or contrast:

• Ella començarà... = She will start...

This is similar to Spanish and unlike English, where the subject usually has to be stated.

These are in the simple future.

Catalan usually forms the future by adding endings to the infinitive:

• començar
  • -à → començarà
• acabar
  • -à → acabarà

The ending -à here is the third person singular future ending, so it means:

• he/she/it will start
• he/she/it will finish

Other future endings are:

• -é
• -às
• -à
• -em
• -eu
• -an

They help with pronunciation and stress.

1. The accent in començarà and acabarà

The à shows that the stress falls on the last syllable:

• comen-ça-rà
• aca-ba-rà

2. The accent in reunió

The ó shows that the stress is also on the last syllable:

• re-u-ni-ó

3. The ç in començarà

The letter ç is pronounced like an s sound.
It is used before a, o, u to keep that soft sound.

So començar is pronounced with an s sound, not a k sound.

l'oficina is the article + noun form of la oficina, but Catalan drops the a of la before a vowel:

• la oficina → l'oficina

Then with the preposition a, you get:

• a l'oficina

So the apostrophe shows that the article has been shortened before a vowel.

Also, Catalan a can often mean to, at, or in, depending on context. Here a l'oficina means at the office or in the office.

Because reunió is a feminine noun, it takes una:

• una reunió = a meeting

A useful pattern is that many Catalan nouns ending in -ió are feminine:

• informació
• decisió
• reunió

So using una here is normal.

Also, una reunió uses the indefinite article because it means a meeting, not the meeting. If it were a specific known meeting, you might say la reunió.

After abans, Catalan normally uses de:

• abans de... = before...

Then dinar can work very naturally here.

abans de dinar

This usually means:

• before lunch
• before having lunch

Here dinar behaves like an infinitive or a meal word used in a general sense.

abans del dinar

This would mean:

• before the lunch
• before the lunch meal/event

That sounds more specific, as if you are referring to a particular lunch.

So abans de dinar is the natural choice in this sentence.

Yes. That is very common in Catalan.

• As a verb, dinar means to have lunch
• As a noun, dinar means lunch

So in abans de dinar, learners often notice that it can feel slightly ambiguous in form, but the meaning is perfectly natural in Catalan. Context tells you it means before lunch / before having lunch.

Not usually.

In Catalan, when i joins two closely connected clauses, especially with the same subject, the comma is often omitted:

• La meva mare començarà una reunió a l'oficina i acabarà abans de dinar.

That version is very natural.

The comma in your sentence is not impossible, but it is more of a stylistic pause than a strict requirement. Many writers would leave it out.

Because once the subject is clear, Catalan often avoids repeating it unnecessarily.

So this is completely normal:

• La meva mare començarà... i acabarà...

The subject of both verbs is understood to be the same person.

If you repeated it, the sentence would still be grammatical, but less natural unless you wanted emphasis:

• La meva mare començarà una reunió a l'oficina, i la meva mare acabarà abans de dinar.

That sounds repetitive in ordinary speech.