OK this is how you play it on bass. wait until after the guitar part in begiinning to start...

G---------------------------------------------------------
D---------------------------------------------------------
A---2-0-2-------------------------------------------------
E--------3-2-0-2-3----------------------------------------
repeat until 1st verse then:

G---------------------------------------------------------
D---------------------------------------------------------
A---2-2-2-2-2-2-------------------------------------------
E----------------3-3-3-3-3-0-0-0-0-0-2-2-2-2-2------------
repeat until chorus

G---------------------------------------------------------
D---------------------------------------------------------
A--------4-4-4-------2-2-2--------------------------------
E-0-0-0---------2-2-2-------------------------------------
repeat until chnges to 8th notes and play same as above until until you get back to same 
notes as in the beginning.

AND THATS IT. it may be confusing but listen to song and youll figure out timings a such.