Your example is right, but it’s not true that it’s used in all subordinate clauses. For example, “Estoy buscando a la persona que escribió ese libro” (I’m looking for the person who wrote that book) does not have any verb in subjunctive mood.
Your example is right, but it’s not true that it’s used in all subordinate clauses. For example, “Estoy buscando a la persona que escribió ese libro” (I’m looking for the person who wrote that book) does not have any verb in subjunctive mood.