La carrera solidaria empieza mañana.

In Spanish, it is very common to use the definite article (el, la, los, las) where English might leave it out.

So la carrera means the race. In a sentence like this, Spanish normally sounds more natural with the article because it is referring to a specific event.

Compare:

• La carrera empieza mañana = The race starts tomorrow
• Carrera on its own would usually sound incomplete here unless it appeared in a different context, like a heading or label.

Solidaria means something like charity-related, for a good cause, or in support of others.

So carrera solidaria is a very common Spanish expression for a charity run/race or fundraising race.

It comes from solidario / solidaria, which describes a person or activity that shows solidarity or support for others.

Because carrera is feminine, the adjective also has to be feminine:

• carrera solidaria
• but evento solidario

In Spanish, adjectives usually come after the noun, unlike in English.

So:

• carrera solidaria literally follows the pattern race charitable

This is the normal word order in Spanish. English usually puts the adjective first:

• charity race

Spanish can sometimes place adjectives before the noun, but that often changes the tone or meaning. In this sentence, solidaria after carrera is the standard and natural order.

Empieza is the third-person singular present tense form of the verb empezar (to start / to begin).

The subject is la carrera, which is singular, so the verb must also be singular:

• La carrera empieza = The race starts

If you used empezar, that would be the infinitive, equivalent to to start, and it would not work as the main conjugated verb in this sentence.

Conjugation of empezar in the present:

• yo empiezo
• tú empiezas
• él / ella / usted empieza
• nosotros empezamos
• vosotros empezáis
• ellos / ellas / ustedes empiezan

This is a stem-changing verb. In the present tense, e in the stem often changes to ie in some forms.

So:

• empezar → empiezo, empiezas, empieza, empiezan

But not in all forms:

• nosotros empezamos
• vosotros empezáis

This is a very common pattern in Spanish. Other verbs like this include:

• pensar → pienso
• cerrar → cierro
• comenzar → comienza

Spanish often uses the present tense to talk about a scheduled or near-future event, just like English does.

So:

• La carrera empieza mañana means The race starts tomorrow

This is completely natural in Spanish. It sounds like a planned event.

You could also say:

• La carrera va a empezar mañana = The race is going to start tomorrow
• La carrera empezará mañana = The race will start tomorrow

But the present tense is very common and natural for this kind of situation.

It can mean either tomorrow or morning, depending on context.

Here, mañana means tomorrow because it comes after the verb and refers to when the race starts:

• La carrera empieza mañana = The race starts tomorrow

If you wanted to say in the morning, you would usually say:

• La carrera empieza por la mañana = The race starts in the morning

So context tells you which meaning is intended.

The tilde in mañana is part of the correct spelling. It marks the letter ñ, which is a different letter from n.

So:

• n and ñ are not the same in Spanish

Mañana is pronounced roughly like ma-NYA-na, not ma-na-na.

This is important because changing ñ to n creates a spelling mistake and can change pronunciation completely.

Yes. Comienza from comenzar also means starts/begins, and it works very naturally here.

So both are correct:

• La carrera solidaria empieza mañana
• La carrera solidaria comienza mañana

In everyday Spanish, empezar and comenzar are very close in meaning. Comenzar can sound a little more formal in some contexts, but both are common and correct.

The whole subject is la carrera solidaria, but the main noun is carrera, which is singular and feminine.

The verb agrees in number, not in gender, so the important thing for the verb is that the subject is singular:

• La carrera solidaria empieza

If the subject were plural, the verb would be plural too:

• Las carreras solidarias empiezan mañana

So:

• singular subject → empieza
• plural subject → empiezan

A clear Spain Spanish pronunciation would be approximately:

la ka-RRE-ra so-li-DA-ria em-PIE-tha ma-NYA-na

A few notes:

• rr in carrera is a rolled r
• ie in empieza sounds like ye together
• in most of Spain, z in empieza is pronounced like the th in think
• ñ in mañana sounds like ny in canyon

If you use a Latin American pronunciation, empieza would usually sound with an s sound instead of th, which is also correct in its own variety.