Relative Pro
Link whole ideas into one sentence — whose, which, the one who — out loud.
Cuyo means 'whose' and agrees with the thing possessed, not the owner: el escritor cuyo libro ganó el premio (cuyo agrees with libro), la profesora cuya clase es la más popular. El cual / la cual is a formal 'which', useful after prepositions: la empresa, en la cual trabajo. Lo cual refers back to an entire clause: Aprobó el examen, lo cual le puso muy contento. Worth knowing: in everyday Latin American speech, plain que does most of this work — el amigo con el que viajé — while cuyo and el cual live mostly in writing and formal talk.
Below: each pronoun lesson by lesson, where speech and writing part ways, the agreement traps — and a way to build long sentences where it counts: live, mid-conversation.
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Regional Spanish
Textbooks teach one word. Locals use several — pick your region's and stay consistent.
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The part no drill site can do
Carla
Your grammar teacher for this pack
Nothing here works like a grammar workbook. In the Relative Pro lessons you talk, and Carla keeps asking for one more layer of detail: describe a person without starting a new sentence (mi hermano, quien vive en Madrid…), say whose things you're talking about with cuyo, then comment on the whole story you just told with lo cual. When you're describing something that may not exist yet, she flips you into the subjunctive — busco un apartamento que tenga terraza — and you feel the difference instead of memorising it.
Blank mid-sentence and nothing bad happens — she waits. That's the practice, without unnecessary judgement.
Finish the 6 lessons and Relative Pro is yours — earned, not given.
First 10 lessons free · 10-minute spoken lessons · your AI coaching team remembers you
Quick answers
Cuyo / cuya / cuyos / cuyas — and it agrees with the thing possessed: el edificio cuyos balcones dan al parque (cuyos agrees with balcones, not edificio). It's rare in casual speech but standard in writing, journalism and formal contexts.
In formal registers, after longer prepositions, or when you need extra clarity: Los documentos, los cuales firmé ayer, están listos. In conversation people reach for que or donde instead: la empresa donde trabajo beats en la cual trabajo.
Lo que = 'what', introducing new information: Lo que me sorprendió fue su actitud. Lo cual = 'which', pointing back at a whole clause already said: Aprobó el examen, lo cual le puso muy contento.
In everyday speech, almost always que: el amigo con el que viajé. Quien survives after prepositions and in formal or non-restrictive clauses: la persona a quien llamé no contestó.
When the thing you're describing isn't known to exist yet: Busco un apartamento que tenga terraza (still looking — subjunctive) vs Tengo un apartamento que tiene terraza (it exists — indicative).
