I’ll write to you
Te escribiré o te llamaré la próxima semana.
I'll write to you or call you next week.
I'll write to you when I finish.
Te escribiré la semana que viene.
I'll write to you next week.
Te escribiré o te llamaré la semana próxima.
I'll write to you or call you next week.
Te escribiré en cuanto llegue.
I’ll write to you as soon as I arrive.
I’ll write you a letter.