Usages of serio
El mandato informal se usa con amigos, mientras que el formal es para situaciones serias.
The informal command is used with friends, while the formal one is for serious situations.
Mi hermano está serio hoy.
My brother is serious today.
Ella explica que una hipoteca grande sin buen salario puede ser un problema serio.
She explains that a big mortgage without a good salary can be a serious problem.
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