Mi amiga tiene frío y cierra la ventana.

Amiga is the feminine form of amigo. Since the friend is female, Spanish uses amiga.

• mi amigo = my male friend
• mi amiga = my female friend

The word mi means my and does not change for masculine vs. feminine singular nouns.

Mi without an accent means my.

• mi amiga = my friend

Mí with an accent is a pronoun meaning me after a preposition.

• para mí = for me
• sin mí = without me

So in this sentence, mi is correct because it is a possessive adjective.

In Spanish, physical sensations like being cold, hot, hungry, or thirsty are often expressed with tener (to have), not ser or estar.

So:

• tiene frío = literally she has cold
• natural English meaning = she is cold

Other common examples:

• tengo hambre = I am hungry
• tenemos sed = we are thirsty
• tiene calor = he/she is hot

This is just a normal Spanish pattern you need to learn as a chunk: tener + noun for many physical states.

The accent mark shows the correct stress and also helps show that í and o are pronounced in separate syllables:

• frí-o

Without the accent, Spanish spelling rules would suggest a different stress pattern. So the written accent is necessary.

Because the verb is cerrar (to close), and in the present tense it is a stem-changing verb:

• cerrar
• yo cierro
• tú cierras
• él/ella/usted cierra
• nosotros cerramos
• ellos/ellas/ustedes cierran

The stem changes from e to ie in most forms, including cierra.

So:

• mi amiga cierra la ventana = my friend closes the window

In Spanish, the subject pronoun is often omitted because the verb ending usually makes the subject clear.

Here, cierra is the él/ella/usted form, and the subject already mentioned is mi amiga, so it means:

• My friend is cold and closes the window
• or more naturally, My friend is cold and she closes the window

Spanish avoids repeating the subject when it is already clear.

Because Spanish often drops subject pronouns like yo, tú, él, ella when they are not needed.

English usually says:

• My friend is cold and she closes the window

Spanish normally says:

• Mi amiga tiene frío y cierra la ventana

The she is understood from mi amiga and the verb form cierra.

Spanish often uses the definite article (el, la, los, las) more often than English does.

So la ventana means the window. In this sentence, it sounds natural because it refers to a specific window in the situation.

• cerrar la ventana = to close the window

Even when English might sometimes leave something more general, Spanish often keeps the article.

Y normally means and.

• tiene frío y cierra la ventana = is cold and closes the window

It changes to e before words that begin with an i sound:

• padre e hijo = father and son
• siete e incluso ocho = seven and even eight

But here the next word is cierra, so y stays y.

It can be either, depending on context. The Spanish present tense often covers both the simple present and the present progressive in English.

So cierra la ventana can mean:

• she closes the window
• she is closing the window

In an isolated sentence like this, English often uses closes, but the exact translation depends on context.

Yes.

In this sentence, frío functions as a noun in the expression tener frío.

But frío can also be an adjective:

• el clima frío = the cold weather
• agua fría = cold water

So Spanish uses the same word in different ways depending on the structure.

A simple pronunciation guide is:

mee ah-MEE-gah TYEH-neh FREE-oh ee SYEH-rrah lah ben-TAH-nah

A few notes:

• mi sounds like mee
• amiga stresses the second syllable: a-MI-ga
• tiene is roughly TYEH-neh
• frío has two syllables: FREE-oh
• cierra begins with an s sound in most of Latin America: SYEH-rra
• v in ventana often sounds close to a soft b in Spanish

Not if you mean she feels cold.

• Mi amiga tiene frío = My friend is cold / feels cold

But está fría usually describes something that is cold to the touch or in temperature, and with a person it can sound like you are describing their body, manner, or emotional coldness depending on context.

So for the physical sensation a person feels, tener frío is the normal choice.