hey all you do for the bass part is match this frets up with the chords
(verse: C G D Dsus D Dsus  C G F    and chorus:  Am C G D)  


verse:  C          G        D    C     G     F
G\---------------------------------------------------------
D\--------------------------0------------------------------
A\------3------------------------3-------------------------
E\-----------------3-------------------3-----1-------------

Chorus:  Am        C        G      D
G\---------------------------------------------------------
D\---------------------------------0-----------------------
A\-------0---------3---------------------------------------
E\--------------------------3------------------------------