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----------|