Active or Passive?!

Which of the following sentences are Active and which are Passive?!
11. Jennifer has to be more careful next time.	Active Passive
12. Grandparents have more experience than we have.	Active Passive
13. We are taught their past in our schools.	Active Passive
14. The old people are often mistreated.	Active Passive
15. Leila likes to keep her grandmother company.	Active Passive
16. We like to listen to their amusing long stories.	Active Passive
17. Old people used to be respected once.	Active Passive
18. They tried to make life easier for us.	Active Passive
19. They have to be given much attention.	Active Passive
20. Young people will become old in few years time.	Active Passive
You have got correct answers out of 10
******************** CHECK FOR CREECTION ************** 11. Jennifer has to be more careful next time. [ACTIVE] 12. Grandparents have more experience than we have.[ACTIVE] 13. We are taught their past in our schools.[PASSIVE] 14. The old people are often mistreated. [PASSIVE] 15. Leila likes to keep her grandmother company.[ACTIVE] 16. We like to listen to their amusing long stories.[ACTIVE] 17. Old people used to be respected once. [PASSIVE] 18. They tried to make life easier for us.[ACTIVE] 19. They have to be given much attention.[PASSIVE] 20. Young people will become old in few years time.[ACTIVE]