Quiero sentarme junto a la ventana en el tren.

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Breakdown of Quiero sentarme junto a la ventana en el tren.

• querer: to want
• la ventana: the window
• en: on

Questions & Answers about Quiero sentarme junto a la ventana en el tren.

Why is it sentarme and not just sentar?

Because sentarse means to sit down, while sentar usually means to seat someone/something or to make someone sit.

• Quiero sentarme = I want to sit down
• Quiero sentar al niño = I want to seat the child

So in your sentence, the speaker is doing the action to themself, which is why Spanish uses the reflexive form sentarse.

What does the -me in sentarme mean?

The -me is the reflexive pronoun meaning myself. In this sentence, it shows that the subject and the person affected by the action are the same.

• sentarme = to sit myself / to sit down
• sentarte = to sit yourself / to sit down
• sentarse = to sit oneself / to sit down

In natural English, we usually just say sit down, not sit myself, but Spanish often uses the reflexive structure here.

Why is the reflexive pronoun attached to the infinitive? Could I also say Me quiero sentar?