Eu gosto de deixar um marcador no livro e outro no caderno.

Because gostar normally takes the preposition de before a noun or an infinitive.

• gosto de café = I like coffee
• gosto de ler = I like to read
• gosto de deixar = I like to leave

So after gosto, you usually need de.

After gosto de, the next verb normally stays in the infinitive.

So:

• Eu gosto de deixar...
• Ela gosta de estudar...
• Nós gostamos de viajar...

You do not conjugate the second verb here. The conjugated verb is gosto, and deixar remains unchanged.

In this sentence, deixar means something like to leave or to place and keep there.

It often has the idea of putting something somewhere and letting it stay there.

Examples:

• deixar o celular na mesa = to leave the phone on the table
• deixar um marcador no livro = to leave a marker/bookmark in the book

So it is not just put in a momentary sense; it suggests leaving it there.

Because Portuguese, like English, often avoids repetition when the noun is already understood.

• um marcador no livro e outro no caderno

Here, outro means another one / another marker.

You could say um marcador no livro e outro marcador no caderno, but that sounds more repetitive. The shorter version is more natural.

Outro means another or the other one, depending on context.

In this sentence, it means another marker:

• um marcador = one marker
• outro = another one

It agrees in gender and number with the noun it replaces:

• outro for a masculine singular noun like marcador
• outra for a feminine singular noun
• outros / outras for plurals

Examples:

• um livro e outro
• uma caneta e outra

Because no is a contraction of em + o.

• em + o = no
• em + a = na
• em + os = nos
• em + as = nas

So:

• no livro = em o livro
• no caderno = em o caderno

The full forms em o and em a are generally not used in normal Portuguese.

Here it means in the book.

Portuguese often uses em where English may choose in, on, or at, depending on context. In this sentence, a marker is being left inside the book or notebook, so no livro and no caderno are understood as in the book and in the notebook.

Portuguese uses definite articles much more often than English.

So expressions like:

• no livro
• na escola
• no carro

can sound very natural in Portuguese even when English might use no article or a different article.

In this sentence, no livro and no caderno sound natural and specific in Portuguese. English article usage does not always match Portuguese article usage.

Yes. In Brazilian Portuguese, that is very common.

Because gosto clearly shows the speaker is I, the subject pronoun eu is often omitted:

• Eu gosto de deixar...
• Gosto de deixar...

Both are correct. Including Eu can add emphasis, contrast, or clarity.

Yes, but this order is the most straightforward and natural.

The pattern is:

• verb + object + location
• deixar um marcador no livro
• e outro no caderno

It is clear and balanced. Portuguese often likes this kind of parallel structure.

You could rearrange parts for emphasis, but the original version sounds very natural.

That depends on what kind of marker you mean.

• marcador is a general word: marker, bookmark, something used to mark a place
• marca-página is more specifically bookmark

So if you specifically mean a bookmark in a book, marca-página may be more precise. But marcador can work if the context is clear, especially if you are talking more generally about something used to mark a place in a book or notebook.

• livro = book
• caderno = notebook

A caderno is usually something you write in, like a school notebook or notepad. A livro is a book meant to be read.

That is why the sentence contrasts the two naturally: one marker in the book, another in the notebook.

Yes, but it means something slightly different.

• um marcador no livro e outro no caderno emphasizes one in each
• marcadores no livro e no caderno is more general: markers in the book and notebook

So the original sentence is more precise and neatly pairs the two items.

In most Brazilian accents, gosto sounds roughly like GOHS-too, but with Portuguese vowel quality.

A simple learner-friendly approximation:

• gos = like gohs
• to = like too, but shorter

Also:

• the s in gosto is usually an s sound here
• the final o in Brazilian Portuguese often sounds closer to u than a full English o

So many learners hear something close to GOHS-tu.

Yes. It shows several very common Portuguese patterns all at once:

1. gostar de + infinitive

   • gosto de deixar

2. contraction of preposition + article

   • em + o = no

3. avoiding repetition with outro

   • um marcador ... e outro ...

4. optional subject pronoun

   • Eu gosto... / Gosto...

So this is a very useful model sentence for everyday Portuguese structure.