3) To soften a statement, suggestion or request
* as oppose to using poder (pudiera), querer(quisiera), deber(debiera) with past subjunctive to add an apologetic tone.
I would like $5.
You should go out more, do not say yourself alone at home, it's worse.
Could you tell me where is the office of the director?
You should quit smoking.
Querría cinco dólares.
Deberías salir más, no se quedes solo en case, es peor.
¿Podría usted decirme dónde está la oficina del director?
Debería usted dejar de fumar.