Me enteré esta mañana de que la reunión empieza antes.

Me enteré means I found out or I learned in the sense of becoming aware of some new information.

In this sentence, Me enteré esta mañana de que la reunión empieza antes means that this morning was the moment when the speaker got the news.

A useful pattern to remember is:

• enterarse de algo = to find out about something
• enterarse de que... = to find out that...

So here:

• Me enteré = I found out
• de que la reunión empieza antes = that the meeting starts earlier

Because the verb here is enterarse, which is a pronominal verb. In this meaning, Spanish normally uses the reflexive-style pronoun:

• me entero
• te enteras
• se entera
• nos enteramos, etc.

So you do not normally say just enteré with this meaning.

Compare:

• Me enteré de la noticia = I found out the news
• ¿Te enteraste? = Did you find out?

There is also a non-pronominal verb enterar, but it means something different, more like to inform someone:

• Le enteraron de lo ocurrido = They informed him/her of what happened

For everyday speech, if you want to say I found out, think of enterarse.

Because enterarse requires the preposition de.

So the structure is:

• enterarse de algo
• enterarse de que + clause

Examples:

• Me enteré de la noticia = I found out about the news
• Me enteré de que cambiaron el horario = I found out that they changed the timetable

So in your sentence:

• Me enteré de que... = I found out that...

This is completely correct. The de belongs to enterarse, and que introduces the following clause.

Because in Spanish, many time expressions are used without a preposition.

So you say:

• hoy = today
• ayer = yesterday
• mañana = tomorrow
• esta mañana = this morning
• este año = this year

Examples:

• Llegó ayer
• Nos vimos esta mañana
• Empieza mañana

Using en esta mañana would sound unnatural in normal Spanish for this meaning.

Because Spanish often uses the present tense to talk about scheduled or arranged future events.

So:

• La reunión empieza antes = The meeting starts earlier
• El tren sale a las ocho = The train leaves at eight
• Mañana trabajo = I’m working tomorrow

This is very common and natural.

If you said empezará, that would also be possible, but it can sound a bit more like a prediction or a more detached future statement. For schedules and arrangements, the present tense is often preferred.

Here antes means earlier.

So la reunión empieza antes means:

• the meeting starts earlier
• the meeting starts sooner than expected
• the meeting has been moved to an earlier time

Spanish often leaves the comparison implied if it is already understood from context.

For example:

• La reunión empieza antes = The meeting starts earlier
• La reunión empieza antes de las ocho = The meeting starts before eight
• La reunión empieza antes de lo previsto = The meeting starts earlier than planned

In your sentence, antes is being used on its own because the missing comparison is understood.

Because the subject is la reunión, which is third person singular.

So the verb must also be third person singular:

• la reunión empieza
• el tren sale
• la clase termina

Also, empezar is a stem-changing verb in the present tense:

• empiezo
• empiezas
• empieza
• empezamos
• empezáis
• empiezan

So empieza is the correct form for la reunión.

Yes, but it is not exactly the same in tone.

• Me enteré is the most natural everyday way to say I found out
• Supe can also mean I found out, but it often sounds a bit more literary, formal, or less conversational in many contexts

So for normal spoken Spanish, especially in everyday situations, me enteré is usually the safer and more natural choice.

Compare:

• Me enteré esta mañana de que la reunión empieza antes = very natural in conversation
• Supe esta mañana que la reunión empieza antes = possible, but often less colloquial

Yes — that is a very good observation.

In much of Spain, especially in standard Peninsular usage, the present perfect is often used for actions connected with today or another time period that is still seen as current:

• Esta mañana me he enterado de que...
• Hoy he visto a Marta
• Esta tarde hemos hablado

So if it is still the same day, many speakers in Spain would naturally say:

• Me he enterado esta mañana de que la reunión empieza antes

However, me enteré esta mañana is still grammatical and fully understandable. It may sound more natural in some regions or in contexts where the speaker sees the morning as a finished time frame.

So for Spanish from Spain, both are possible, but me he enterado esta mañana is often the more typically Peninsular choice if it is still today.

Yes. Spanish allows some flexibility in word order.

All of these are possible:

• Me enteré esta mañana de que la reunión empieza antes
• Esta mañana me enteré de que la reunión empieza antes
• De que la reunión empieza antes me enteré esta mañana — grammatical, but much less natural in normal conversation

The most natural choices are usually the first two.

The version with esta mañana at the beginning often gives a little more emphasis to when you found out:

• Esta mañana me enteré... = This morning, I found out...

Because Spanish often uses the definite article where English might not think about it as much.

Here la reunión means the meeting, referring to a specific meeting that both speaker and listener can identify from context.

So:

• la reunión = the meeting
• una reunión = a meeting

If you said:

• Me enteré esta mañana de que una reunión empieza antes

that would suggest some meeting or a meeting, not a specific known one. In most normal situations, la reunión is the natural choice.