Gender of Nouns (1 y 2)
https://studyspanish.com/grammar/lessons/genoun1
Use of A+personal
https://studyspanish.com/grammar/lessons/persa
SUBJUNTIVE (desde 77 al 84)
https://studyspanish.com/grammar/lessons/subj1
SER & ESTAR (From number 15-18) and mini-tests
https://studyspanish.com/grammar/test/serest1
POR o PARA
https://studyspanish.com/grammar/lessons/porpara