verse bass fill:
G|-----------------|
D|-2-2-2-2-2-0-----| Bass plays this fill twice
A|-------------2-0-| during the verses.
E|-----------------|

  prechorus bass riff:
G|---------------------------------|
D|-----1-1-4-4-1-1-----1-1-4-4-1-1-| Bass plays this riff when
A|-2-2-------------2-2-------------| the guitar plays the B chord.
E|---------------------------------|

  chorus bass riff:
G|---------| |---------|       This bass riff is played during the
D|---------| |---------|       "you've got to come back" portion of
A|-----5-5-| (4x)  |-----2-2-| (4x)  the choruses.  This riff may also be
E|-3-3-----| |-0-0-----|       played one octave higher.

      -songflow-
 intro          drums...
 verse          E
 prechorus      B  E  (2x)
 verse          E
 prechorus      B  E  (2x)
 chorus         G  E  (8x)
 bridge         E (guitar) & G (bass)
 verse          E
 prechorus      B  E  (2x)
 chorus         G  E (12x)
 end            G