1-5 present tense 6-10 ser vs estar 11-15 conocer vs saber 16-20 reflexive verbs 21-25 present progressive and gerunds 26-30 linguistics 31-35 question words 36-40 informal commands 41-45 preterit 46-50 preterit vs imperfect 51-55 past participles 56-60 present perfect
