I'm With You bass tab by Avril Lavigne

Intro and Verse-
theres not anything here on the normal versions but on acoustic performances there has
this bass line going in the same rhythm to the guitar, it still works with the album version
G-----------------------------|
D-----------------------------|
A-0------2------4------5------|
E-----------------------------|

Chorus
G-------------------------------|
D-------------------------------|
A-0-0000-2-2222-5-5555----------| x 2
E-----------------------3-3333--|

on "won't you"
G-------------------------------|
D-------------------------------|
A-0-0000-2-2222-4-4444-5-5555---|
E-------------------------------| x 1

Then play the first part of the chorus again

Verse Two
G-----------------------------|
D-----------------------------|
A-0------2------4------5------|
E-----------------------------| x 4

G-----------------------------|
D-----------------------------|
A-0-0000-2-2222-4-4444-5-5555-|
E-----------------------------| x 2
p.m...........................

Build Up - "isn't anyone trying to find me"
G-----------------------------|
D-----------------------------|
A-0----2-4-5-7-5-4-----5------|
E------------------0----------|

CHORUS

BRIDGE (louder part)
repeat
G-----------------------------|
D-----------------------------|
A-0-0000-2-2222-4-4444-5-5555-|
E-----------------------------|

until she hits the high note which is just
G------------------------------|
D------------------------------|
A-5-555555555555---------------|
E-----------------3-3333333333-|

-
Nothing for quiet bit
-

Repeat chorus til the end.

end on

a - 0


and thats it.  the amount of each note might be slightly off but you get the idea.