Preterite: completed action, beginning/end to a past action, narrate past events
Imperfecto: ongoing action, habitual past actions, mental/physical/emotional state
The quincenero means a boy (Because of ending in O) that is turning 15.
1)D
2)C
3)D
4)D
5)C
6)D
for the second part of the sheet.
1) podemos
2) trabajan
3) usa
4) estas
5) quieren
6) destruyen