El Pluscuamperfecto de Subjuntivo

https://aprenderespanol.org/ejercicios/verbos/subjuntivo/preterito-pluscuamperfecto-formas

REPASO - UNIDADES 9 Y 10

https://121spanish.com/futuro-perfecto

https://121spanish.com/futuro-perfecto.html

https://www.amautaspanish.com/study-spanish-online/exercises/preposiciones--por-y-para-1-44-101.html

https://www.amautaspanish.com/study-spanish-online/exercises/preposiciones--por-y-para-2-44-101.html

https://www.amautaspanish.com/study-spanish-online/exercises/preposiciones--por-y-para-3-44-101.html