The Bass works pretty much the same way through the all song.
It goes this way right from the beginning.

G|------------------------------------------------|
D|------------------------------------------------|
A|-0-0---33--2------------------------------------|   2X
E|---------------0-0---33--2----1---11--1---3-----|


Chorus

G|-------------------------------------------------|
D|-------------------------------------------------|
A|-333333----555555-------888888-------------------|
E|---------------------------------222222----------|