Answer:
8. habría descubierto
9. habría conocido
10. habríamos participado
11. habrían comprado
12. habríamos apreciado
Explanation:
This tense is "condicional perfecto". We use it in practically the same cases as the "condicional simple", but it refers to actions already completed.
This tense is used in Spanish to:
* express demand or desire for an action that has not taken place
* state an assumption about something that happened in the past
* describe the hypothetical scenario of a past action in conditional sentences
For number 1 and 2 it is corre,empezó and for number 3 it’s son,eran
