La actriz italiana envía una carta.

La is the feminine singular definite article, equivalent to the.

It matches actriz, which is a feminine singular noun:

• la actriz = the actress

Spanish articles usually have to agree with the noun in gender and number:

• el actor = the actor
• la actriz = the actress
• los actores = the actors
• las actrices = the actresses

The standard feminine form of actor is actriz.

So:

• actor = actor
• actriz = actress

This is just one of those noun pairs you learn as a set. Not all feminine forms are made by simply adding -a.

Because italiana is describing actriz, which is a feminine singular noun.

In Spanish, adjectives must agree with the noun they describe:

• actor italiano = Italian actor
• actriz italiana = Italian actress

So the adjective changes form to match gender and number.

In Spanish, descriptive adjectives often come after the noun.

So:

• la actriz italiana = the Italian actress

This is the most natural order in a basic sentence. English usually puts adjectives before the noun, but Spanish often puts them after.

Envía is the third-person singular present tense form of enviar.

That means it goes with subjects like:

• él = he
• ella = she
• usted = you (formal)
• or a singular noun phrase like la actriz italiana

So:

• La actriz italiana envía... means that the Italian actress sends / is sending...

The accent mark shows the correct stress and helps show that í and a are pronounced in separate syllables.

So envía is pronounced roughly:

• en-VEE-a

Without the accent, Spanish spelling rules would suggest a different pronunciation.

This accent is very common in forms of verbs like enviar:

• yo envío
• tú envías
• él/ella envía

It can mean either one, depending on context.

Spanish uses the simple present more broadly than English:

• La actriz italiana envía una carta can mean The Italian actress sends a letter or The Italian actress is sending a letter

If you specifically want to emphasize is sending right now, Spanish can also use:

• está enviando

But the simple present is completely normal here.

Una is the feminine singular indefinite article, meaning a or an.

So:

• una carta = a letter

Spanish often uses articles where English does too, and carta is a feminine noun, so it takes una:

• una carta
• not un carta

Because it uses the article una, and its adjective/article agreement will be feminine.

Also, many nouns ending in -a are feminine, and carta is one of them:

• la carta
• una carta

Just remember that grammatical gender is a property of the noun itself. It does not mean the object is biologically female.

In most of Latin America, z is pronounced like s.

So actriz sounds roughly like:

• ak-TREES

This is different from most of Spain, where z is often pronounced like the th in think.

A rough Latin American pronunciation is:

• en-BEE-ah

A few useful notes:

• The v in Spanish sounds very similar to b
• The stress falls on -ví-
• The final -a is a separate syllable because of the accent mark

So it is en-ví-a, three syllables.

Yes. Spanish often leaves out subject pronouns and even noun subjects when the context is clear.

So in context, you could simply say:

• Envía una carta.

Because the verb form envía already tells you it is third-person singular, the listener may be able to understand who is doing the action from context.

However, in your full sentence, La actriz italiana is included for clarity and emphasis.

The normal neutral order is:

• La actriz italiana envía una carta.

That is:

• subject + verb + object

Spanish word order is somewhat flexible, but this version is the most standard and natural for a simple statement.

You might change the order for emphasis, but as a learner, the basic pattern here is the best one to use.