Importante: USO DE LOS TRES AUXILIARES PRINCIPALES.

PARA CLAVARLA EN CUALQUIER EXAMEN:


This is a good tool to get rid of dozens of disturbing mistakes we constantly do. Make sure you print it and go through it:

https://drive.google.com/file/d/0Bz-7_bts4D2QOUhZRFlJVXNaaVE/view?usp=sharing