umm... for the bass? or for the base? well, I usually play it like this... the chords are D, Cadd9, and G
it just goes like this:
e|------------------------------------3----------
B|----------3-------------3-----------0----------
G|-------------2------------0---------0----------
D|--0--0------------------------------0----------
A|-----------------3--3---------------2----------
E|------------------------------3--3--3----------

or you could just cheat and just play the chords without picking from the chords.. (\ stands for a downstroke, and ^ is an upstroke)

----\--\---\--^--\--\--\--^--\--\--\
e|--2--2--2--2--0--0--0--0--3--3--3---------------------
B|--3--3--3--3--3--3--3--3--0--0--0---------------------
G|--2--2--2--2--0--0--0--0--0--0--0---------------------
D|--0--0--0--0--2--2--2--2--0--0--0---------------------
A|---------------3--3--3--3--2--2--2---------------------
E|----------------------------3--3--3----------------

now, if you really meant for the bass guitar, then, I have no idea... sorry