________ del colegio tendrás que hacer tus deberes.
When you get back from school you will have to do your homework.
Cuando hayas vuelto
The right answer is "hayas vuelto" , but I don't understand why "volverás" is wrong.
Cuando (When) is followed by a verb in the present subjunctive mood when expressing a future event still to happen. You cannot use the future tense here.
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