Él es alemán. That should be the answer
13. Tú repites
14. Ella compra
15. Nosotros ocurrimos
16. Yo ando
17. Ustedes beben
18. El deber
19. Usted llama
20. Ellas viven
21. Ellos creen
In the fifteenth century, I believe
A good oneis yo estaba corriendo = I was running as estaba can also be used for he/she was running or when using 3rd person singular él quiere ir a Madrid = He wants to go to Madrid -