Las relative clauses añaden información sobre un sustantivo. En "I met a student who speaks three languages.", "who speaks three languages" describe a student. Repasa la guía de estructura de oraciones.
Qué es una relative clause
Es una cláusula dependiente que modifica un sustantivo. "who" se usa con personas; "which", con cosas; "whose", para posesión; "where", para lugares; y "when", para momentos. En defining clauses, "that" puede referirse a personas o cosas.

Defining y non-defining clauses
Una defining relative clause aporta información esencial y no lleva comas: "The student who sits next to me is from Brazil." Una non-defining clause añade información y lleva comas: "CWC, which is located in Los Angeles, welcomes English learners." No admite "that".

Cuándo omitir el pronombre
Puede omitirse si es objeto de una defining clause: "The book I bought is useful." No si es sujeto: "The student who called me is my classmate." Consulta la guía de pronombres.
Errores y práctica
Evita el doble pronombre "The book that I bought it is useful." La forma correcta es "The book that I bought is useful.". Combinar frases e identificar el antecedente mejora tus habilidades de escritura.
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Uso en comunicación real
Describe personas, lugares y experiencias con "who", "where" y "that". En CWC, Grammar se integra con Speaking y Reading & Writing. Connection Questions y las presentaciones semanales de ESS permiten usar estas estructuras. Repasa las reglas gramaticales.

Cómo usar who, whom, which y that
Usa "who" cuando una persona sea sujeto. "whom" es la forma formal para un objeto, aunque en conversación se prefiere "who". "which" se refiere a cosas o animales y "that" a personas o cosas en defining clauses.
- "She is the student who asked the question."
- "The teacher who explained the rule was clear."
- "The professor whom I contacted replied quickly."
- "The professor who I contacted replied quickly."
- "The person to whom I spoke was helpful."
- "The person who I spoke to was helpful."
- "This is the book which helped me understand grammar."
- "The exercise, which took 20 minutes, was useful."
- "The class that starts at 9:00 a.m. is full."
- "The student that won the award gave a speech."
Non-defining relative clauses
Añaden información sobre un sustantivo ya identificado, se separan con comas y no admiten "that". Si se elimina la cláusula, la oración principal sigue completa.
- "CWC, which is located in Los Angeles, welcomes English learners from many backgrounds."
- "My classmate Ana, who speaks Spanish, helped me with the activity."
- "The museum, which we visited on Friday, had a new exhibition."
- "My notebook, that is blue, is on the desk."
- "My notebook, which is blue, is on the desk."
Uso de whose, where y when
"whose" expresa posesión, "where" se refiere a lugares y "when" a momentos. En registros formales pueden aparecer alternativas como "in which" y "on which".
- "I met a student whose pronunciation improved quickly."
- "She is the writer whose essay won the contest."
- "We visited a school whose programs serve international learners."
- "in/at that place."
- "This is the café where we studied."
- "Los Angeles is a city where people use many languages."
- "the café where we studied at."
- "I remember the day when I gave my first presentation."
- "Summer is a season when many students travel."
- "This is the café in which we studied."
- "I remember the day on which we met."
Cuantificadores e ideas completas
Estructuras como "many of whom" y "two of which" describen una parte de un grupo. En una non-defining clause, "which" también puede referirse a toda la idea anterior.
- "none of which."
- "The class has 15 students, many of whom speak more than one language."
- "We completed five activities, two of which involved speaking."
- "She completed her presentation early, which reduced her stress."
Reduced relative clauses
Una cláusula activa puede reducirse a una frase en -ing y una pasiva a un participio pasado. Conserva la cláusula completa si el significado o el sustantivo modificado no quedan claros.
- "Students who attend the workshop should arrive early."
- "Students attending the workshop should arrive early."
- "The assignments that were submitted yesterday have been graded."
- "The assignments submitted yesterday have been graded."
- "The students who are in Room 4 are taking a test."
- "The students in Room 4 are taking a test."
Cómo practicar relative clauses
Combina dos oraciones breves y dibuja una flecha desde la cláusula hasta su antecedente. Decide si la información es esencial o adicional y comprueba las comas.
- "I met a classmate. The classmate lives near campus."
- "I met a classmate who lives near campus."
Preguntas frecuentes
¿Puede "that" referirse a personas?
Sí, en defining clauses, aunque "who" suele resultar más natural. No se usa en non-defining clauses.
Las relative clauses conectan información con precisión. Para aplicar la gramática en conversaciones reales en CWC, contacta con Columbia West College.

