joined, affiliated
¿Cuántos conductores se han afiliado hasta ahora?
How many drivers have signed up so far?
— Una película de miedo (2000)
Este mes se han afiliado muchos.
Many people have joined this month.
No me he afiliado para perder mi empleo.
I didn't join to lose my job.
Se han afiliado dos y otro se lo pensará.
Two have joined and another will consider it.