Usages of quien
La amiga con quien comparto un foro de español me corrige los errores.
The friend with whom I share a Spanish forum corrects my mistakes.
Mi profesora, quien es muy paciente, escucha las preguntas con calma.
My teacher, who is very patient, listens to the questions calmly.
Elon.io is an online learning platform
We have an entire course teaching Spanish grammar and vocabulary.