Quiero quedarme un poco más en la biblioteca.

In Spanish, subject pronouns are often omitted because the verb ending already shows who is doing the action.

• quiero = I want
• The -o ending tells you it is yo.

So Quiero quedarme... is completely natural. You can say Yo quiero quedarme... if you want extra emphasis, contrast, or clarity, but most of the time Spanish leaves yo out.

Quedarme comes from quedarse, which in this context means to stay or to remain.

It breaks down like this:

• quedar = to remain / to be left / to arrange, depending on context
• quedarse = to stay, to remain behind, to keep oneself somewhere

The me means myself, and it is attached to the infinitive because Spanish allows object/reflexive pronouns to be attached to infinitives.

So:

• quiero quedarme = I want to stay
• literally: I want to stay myself

That literal wording sounds odd in English, but it is normal in Spanish.

Yes. That is also correct.

With a conjugated verb plus an infinitive, the pronoun can usually go in either place:

• Quiero quedarme un poco más en la biblioteca
• Me quiero quedar un poco más en la biblioteca

Both mean the same thing. The first version is often slightly more neutral and tidy-looking in writing, but both are very common.

Because quedarse and quedar often mean different things.

In this sentence, quedarse means to stay. That is the verb you need.

Compare:

• Quiero quedarme en la biblioteca = I want to stay in the library
• Quedar by itself often has other meanings, such as:
  • to meet / arrange to meet: He quedado con Ana
  • to be located / end up / fit / remain, depending on context

So here, quedarse is the natural choice for stay.

Here, un poco más means a little longer.

Word-for-word, it is:

• un poco = a little
• más = more

But in context, when talking about staying somewhere, English usually translates this as a little longer, not just a little more.

So:

• Quiero quedarme un poco más = I want to stay a little longer

Spanish often leaves the idea of time understood without saying tiempo.

Más has a written accent because it means more.

This helps distinguish it from mas without an accent, which is a formal/literary word meaning but.

So:

• más = more
• mas = but

In everyday Spanish, you will very often see más.

Because en shows location, while a usually shows movement toward a destination.

Here, the speaker wants to stay in the library, not go to the library.

• en la biblioteca = in the library
• a la biblioteca = to the library

Compare:

• Quiero quedarme en la biblioteca = I want to stay in the library
• Quiero ir a la biblioteca = I want to go to the library

So en is correct because the sentence is about being located there.

Yes. Biblioteca is a feminine noun, so it takes la in the singular.

• la biblioteca = the library
• una biblioteca = a library

Like many Spanish nouns ending in -a, it is feminine, though noun gender always has to be learned as part of the word.

Yes, a little.

The original sentence is very natural:

• Quiero quedarme un poco más en la biblioteca

But you could also say:

• Quiero quedarme en la biblioteca un poco más

Both are correct. The difference is mainly about emphasis and rhythm. The original version sounds very natural and balanced.

Spanish word order is more flexible than English, but not completely free. In this sentence, both placements of en la biblioteca work well.

Yes. In quedarme, the qu before e is pronounced like a hard k sound.

So quedarme sounds roughly like:

• keh-DAR-meh

The u in qu is not pronounced here.

This is the same pattern as in:

• que
• quiero
• quedar

Because Spanish often leaves time implied when the meaning is obvious.

• un poco más already clearly means a little longer in this context

You could say:

• Quiero quedarme un poco más de tiempo en la biblioteca

But that sounds heavier and less natural in many situations. The shorter version is more idiomatic.

So Spanish often prefers the simpler:

• Quiero quedarme un poco más

Yes, but the meaning or tone may change.

For example:

• Quiero permanecer un poco más en la biblioteca = I want to remain a little longer in the library

Permanecer is correct, but it sounds more formal or stiff than quedarse in everyday conversation.

For normal spoken Spanish, quedarse is the most natural choice here.

It works perfectly well in Spain and also in most other Spanish-speaking countries. It is standard, natural Spanish.

Nothing in the sentence is unusually regional. A speaker in Spain would say it, and so would many speakers in Latin America.

So it is a very useful sentence to learn.