Breakdown of Los instructores, los cuales enseñan la postura, suelen corregir los errores.
los
the (masculine plural)
enseñar
to teach
la
the (feminine)
el error
the mistake
corregir
to correct
soler
to usually do / to tend to
la postura
the posture
los cuales
which / who (masculine plural)
el instructor
the instructor
Questions & Answers about Los instructores, los cuales enseñan la postura, suelen corregir los errores.
Why use los cuales here instead of just que or quienes?
Do I have to use the commas around los cuales enseñan la postura?
Yes, the commas are required here if you use los cuales. This is a non-defining clause, meaning it just adds extra background information about the instructors rather than specifying which instructors we mean. When acting as a subject, el cual and its variations can only be used in these comma-separated clauses. If you removed the commas to specify only the instructors who teach posture, you would have to use que.
How do I know whether to use el cual, los cuales, or las cuales?
The relative pronoun has to match the gender and number of the noun it refers back to (its antecedent). Here, it refers back to los instructores, which is masculine and plural. Therefore, you must use the masculine plural form: los cuales.
Why does the sentence use suelen corregir instead of just saying usualmente corrigen?
While usualmente corrigen is grammatically fine, native speakers frequently use the verb soler followed by an infinitive to express that someone "usually" or "normally" does something. Saying suelen corregir is a very natural and common way to express "they usually correct" or "they tend to correct" in Spanish.
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