How to Say "which" in Spanish
The most common Spanish word for “which” is “que” — use 'que' when 'which' acts as a relative pronoun introducing a clause that describes or identifies a noun, similar to 'that' or 'who' in English..
que
/keh//ke/

Examples
El libro que leo es interesante.
The book that I'm reading is interesting.
La casa que tiene el techo rojo es mía.
The house that has the red roof is mine.
Espero que vengas a la fiesta.
I hope that you come to the party.
The Ultimate Connector
Use 'que' to add extra information about a person or thing you just mentioned. It's like 'that', 'which', or 'who' in English all rolled into one.
Don't Forget 'Que'
Mistake: “English often drops 'that' (e.g., 'I think he is nice').”
Correction: In Spanish, you almost always need to keep the 'que': 'Creo que es simpático.'
cual
/kwal//kwal/

Examples
Este es el puente bajo el cual pasamos.
This is the bridge under which we passed.
La reunión, durante la cual se discutieron temas importantes, duró tres horas.
The meeting, during which important topics were discussed, lasted three hours.
Hablé con los gerentes, los cuales confirmaron la decisión.
I spoke with the managers, who confirmed the decision.
The 'Which' That Needs a Buddy
Think of 'cual' as a more specific version of 'que' ('that/which'). It almost always needs a buddy word before it: 'el', 'la', 'los', or 'las'. This buddy has to match the person or thing you're talking about.
Perfect for Use After Short Words (Prepositions)
You'll often see 'cual' used after short connecting words like 'con' (with), 'en' (in), 'sin' (without), or 'por' (for). For example, 'la caja en la cual...' (the box in which...). This makes your sentence super clear.
Forgetting its Buddy Word
Mistake: “La casa en cual nací es azul.”
Correction: La casa en la cual nací es azul. Because 'casa' is feminine and singular ('la casa'), 'cual' needs 'la' as its buddy.
Using it When 'Que' is Better
Mistake: “El coche cual compré es rojo.”
Correction: El coche que compré es rojo. When you're just adding simple information and there's no little word like 'en' or 'con' before it, 'que' is usually the more natural choice.
Que vs. Cual After Prepositions
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