Bass Guitar class

I had the bass guitar class today.
I learned the forth chord progression further more; forth chord progression in different fingers.
Many of my friend at church are busy nowadays preparing for the coming Christmas; some are practicing worship dance, choir is practicing the hymn and the church band is also practicing something.
Last Sunday, I watched them practicing and the drummer seemed to be struggling. While my friend, who is the lead bass guitarist and who can also play drum, guitar and piano, showed him what to do, I played the bass guitar for him. It was actually the first time I played with the others and it was really good. While the drummer went to bathroom, I played the drum as well since I can play drum before the bass, it was also really really good.
I feel I'm improving a lot which is good :D