Tengo que irme temprano de la reunión.

Tener que + infinitive is a very common way to express obligation or necessity in Spanish.

• Tengo que = I have to
• Tengo que irme = I have to leave / I have to go

So in this sentence, tengo que tells you that the speaker feels obliged or needs to do something.

Because irse and ir are not exactly the same.

• ir = to go
• irse = to go away / to leave

In this sentence, the meaning is not just to go, but specifically to leave the meeting. That is why irse is used.

So:

• Tengo que ir = I have to go
• Tengo que irme = I have to leave / I have to go away

The me is the reflexive pronoun that goes with irse.

The verb is normally listed as:

• irse = to leave / to go away

When conjugated, the pronoun changes depending on the subject:

• me voy = I leave / I’m leaving
• te vas = you leave
• se va = he/she leaves
• nos vamos = we leave
• os vais = you all leave
• se van = they leave

In tengo que irme, the me corresponds to yo.

In Spanish, when you have a conjugated verb plus an infinitive, a pronoun can usually go in either of two places:

• before the conjugated verb
• attached to the infinitive

So both of these are correct:

• Tengo que irme temprano de la reunión.
• Me tengo que ir temprano de la reunión.

They mean the same thing. Attaching the pronoun to the infinitive is very common and natural.

Spanish often omits subject pronouns because the verb ending already tells you who the subject is.

• Tengo already means I have
• so yo is not necessary

You could say:

• Yo tengo que irme temprano de la reunión.

But that usually adds emphasis, contrast, or clarity. In normal conversation, just Tengo que... sounds more natural.

Here, temprano is an adverb meaning early.

It describes when the speaker has to leave.

• irme temprano = to leave early

It does not change form for gender or number in this use.

Compare:

• una hora temprana = an early hour
  Here temprana is an adjective.
• salir temprano = to leave early
  Here temprano is an adverb.

De here means from.

The idea is: the speaker is leaving from the meeting.

• irme de la reunión = leave the meeting
• more literally, go away from the meeting

So:

• a la reunión = to the meeting
• de la reunión = from the meeting

In this sentence, the movement is away from the meeting, so de is the correct preposition.

Spanish often uses the definite article where English may or may not use the.

Here, la reunión refers to a specific meeting that speaker and listener can identify.

• de la reunión = from the meeting

Without the article, de reunión would not sound right in this sentence.

Yes, that is also correct and natural.

• Tengo que irme temprano de la reunión
• Tengo que salir temprano de la reunión

Both can mean I have to leave the meeting early.

There is a slight nuance:

• irse focuses on going away / leaving
• salir focuses more on exiting / going out

In many everyday situations, they are interchangeable here.

The given order is very natural:

• Tengo que irme temprano de la reunión.

You may also hear:

• Me tengo que ir temprano de la reunión.

That change is normal because of pronoun placement.

You could move temprano in some contexts, but the original order is the most straightforward and idiomatic for learners. Keeping temprano near irme clearly shows that early describes the leaving.

It is neutral and works well in both spoken and written Spanish.

It is not slang, and it is not especially formal either. You could say it:

• to a colleague
• to a friend
• in a workplace setting
• in a polite conversation

If you wanted to sound a bit more formal, you might say something like:

• Tengo que marcharme temprano de la reunión.

But the original sentence is already perfectly standard and polite.

Yes.

• Tengo que irme temprano de la reunión.
• Tengo que marcharme temprano de la reunión.

Both are correct.

In Spain, marcharse is very common for to leave. It can sound slightly more explicit or a little more formal than irse in some contexts, but both are very natural.

You would change both the main verb and the reflexive pronoun:

• Tenemos que irnos temprano de la reunión.

Breakdown:

• tenemos que = we have to
• irnos = leave
• temprano = early
• de la reunión = from the meeting

So me becomes nos because the subject is now we.