Lesson 1
1.1       The perfect present
1.2       Exercises

Lesson 2
2.1       The past perfect of indicative
2.2       Exercises

Lesson 3
3.1       El future Perfecto
3.2       Exercises

Lesson 4
4.1       El condicional perfecto
4.2       Exercises

Lesson 5
5.1       Analysis for the perfect tenses

Lesson 6
6.1       The Gerund for intermediate level

Lesson 7
7.1       The prepositions por y para
7.2       Exercise

Lesson 8
8.1       The reflexible verbs
8.2       Exercise

Lesson 9
9.1       The relative pronouns
9.2       Exercise