Mi hermana también quiere ir a la biblioteca mañana.

Spanish often leaves out subject pronouns when the verb already shows who the subject is. In quiere, the ending tells you it is he/she/you (formal) wants.

So Mi hermana también quiere ir a la biblioteca mañana is completely natural without ella. Adding ella is possible, but it usually gives extra emphasis or contrast: Mi hermana también quiere ir... = neutral
Ella también quiere ir... = she also wants to go

Quiere is the third-person singular form of querer in the present tense.

It matches mi hermana, which is she:

• yo quiero
• tú quieres
• él/ella quiere

So mi hermana quiere means my sister wants.

After a conjugated verb like quiere, the next verb normally stays in the infinitive.

So:

• quiere ir = wants to go
• quiere comer = wants to eat
• quiere estudiar = wants to study

This is similar to English: we say she wants to go, not she wants goes.

Here, a means to and goes with ir.

• ir a = to go to

So:

• ir a la biblioteca = to go to the library
• ir al cine = to go to the cinema
• ir a casa = to go home

This a is part of the normal pattern with ir when you mention a destination.

Spanish usually uses the definite article with places like this when talking about going to a specific type of place.

So ir a la biblioteca is the normal way to say go to the library.

A few useful comparisons:

• Voy a la biblioteca = I’m going to the library
• Voy al supermercado = I’m going to the supermarket
• Voy a casa = I’m going home

Notice that some destinations, like casa, often do not take the article.

También means also / too, and its position is fairly flexible, but this placement is very common.

In Mi hermana también quiere ir..., it means my sister also wants to go.

You may also hear:

• También mi hermana quiere ir...
• Mi hermana quiere también ir...

But the original sentence sounds very natural and straightforward. Putting también before the verb is often the safest choice for learners.

The accent mark shows where the stress goes: tam-BIÉN.

Without the written accent, Spanish spelling rules would suggest a different stress pattern. So the accent is there to show the correct pronunciation.

It also helps you hear and say the word properly:

• también = also, too

These are two different words:

• mi = my
• mí = me (used after a preposition)

In your sentence, mi hermana means my sister, so you need mi without an accent.

Compare:

• Mi hermana = my sister
• Para mí = for me

Yes, it can move. Spanish word order is flexible, especially with time expressions.

The sentence as given is very natural: Mi hermana también quiere ir a la biblioteca mañana.

But these are also possible:

• Mañana mi hermana también quiere ir a la biblioteca.
• Mi hermana quiere ir mañana a la biblioteca.

Putting mañana at the end is common and sounds neutral.

A few important pronunciation points:

• hermana: the h is silent, so it sounds like ermana
• también: stress the last syllable, tam-BYEN
• mañana: ñ sounds like ny in canyon, so ma-NYA-na
• biblioteca: the c here is a hard k sound because it comes before a

A simple pronunciation guide: Mi er-MA-na tam-BYEN KYE-re eer a la byo-lyo-TE-ka ma-NYA-na

In normal use, the meaning is clear from context.

Mi hermana también quiere ir a la biblioteca mañana most naturally means: My sister also wants to go to the library tomorrow.

Here, también usually refers to my sister as an additional person, or to the whole idea that this is another thing that is wanted.

If you want to be very specific in Spanish, word order and context help:

• Mi hermana también quiere ir... = My sister also wants to go
• Mi hermana quiere ir también... = My sister wants to go too

In everyday conversation, the original sentence is perfectly clear and natural.