I use this app called Photomath is really cool and it gives you the answer by just taking a picture and also it shows you how to do it, they have graphics and things like that
Question 10: voy
Question 11: llega
Question 12: váis
Answer:
yo: construía
tu: construías
el, ella, usted: construía
nosotros: construíamos
vosotros: construíais
ellos, ellas, ustedes: construían
vos: construías