This document provides a summary of Spanish grammar concepts in 12 sections, including:
1. The present tense conjugations of -ar, -er, and -ir verbs
2. Stem-changing verbs that change form except in the nosotros/vosotros forms
3. Irregular "yo" forms such as -go, -zco, ser, ir, saber, and dar
4. The difference between saber and conocer
5. Reflexive verbs where the subject and object are the same
6. The impersonal "se" construction
7. Verbs with diphthongs in the present tense
8. Verbs ending in -uir/-guir, -