Standard tuning
also, you can play nthe intro like this:
e|-------------------------10------------------------------------| X3
B|7h8----7h8-----7h8p7--7h8--------------------------------------|
G|---9-------9--------9------------------------------------------|
D|---------------------------------------------------------------|
A|---------------------------------------------------------------|
E|---------------------------------------------------------------|
[ Tab from: http://www.guitaretab.com/a/avril-lavigne/388898.html ]
e|---3-2---------------------------------------------------------|
B|--3---3--------------------------------------------------------|
G|-2-----2-------------------------------------------------------|
D|0--------------------------------------------------------------|
A|---------------------------------------------------------------|
E|---------------------------------------------------------------|
| / slide up
| \ slide down
| H hammer-on
| p pull-off
| ~ vibrato
| + harmonic
| x Mute note